2020 Best Free CAD Software

3D Builder is a free CAD software app for 3D modeling and printing on desktop PCs and other Microsoft platforms like Xbox One, Hololens, and mobile devices. Similar to Autodesk’s Gallery, users can download 3D models created by others to modify and even 3D print.

The touchscreen interface is used to tweak and edit 3D files with gestures – quite an immersive experience. The integration into the Windows phone has another perk: The free CAD software as a mobile app also enables the user to scan objects and convert them into 3D files using the device’s camera. Simply take a series of photos of the object from several angles, and images are stitched together to recreate the object as a 3D model.

That’s not all this interactive 3D modeling tool has to offer though. 3D Builder is compatible with Microsoft’s 3D Scan app, allowing you to scan yourself in full color. There are also easy-to-use features that enable automatic 3D model repair for 3D printing, smoothing and simplifying features, as well as a drag-and-drop functionality that makes it convenient for beginners to merge and build with basic 3D shapes. Once finished, 3D designs can be exported in 3MF, STL, PLY, or OBJ file formats.

Best free CAD software for: Occasional 3D Modeling

Where to download: Microsoft

Geared toward 3D modeling and animation, 3D Crafter is unique in that it incorporates a drag-and-drop approach, greatly simplifying what can oftentimes be seen as a difficult art. Using Shape Building Tools, users are able to create complex models from basic 3D primitives, which can then be deformed, sculpted, and painted.

Not only can you generate 3D designs on this platform, but you can even create an animated scene by just positioning the shapes from frame to frame. This software tool will help to ensure that the 3D model is properly animated, and can then be distributed once exported into an AVI file. The free version of 3D Crafter is fully functional, and according to the creator Amabilis, ideal for entry-level designers interested in making detailed 3D objects or low-polygon models for game development and animation.

The free version of 3D Crafter is ideal for those interested in designing detailed 3D models or low-polygon models for game development, while the Pro version, which costs around $40, provides further 3D modeling and animation features for designers looking to conjure up more photo-realistic models.

Best free CAD software for: Beginners looking to learn the basics of 3D design, particularly for animation and game development

Where to download: 3DCrafter

Looking for something different than your run-of-the-mill free CAD software? Conventional tools like extrusion, revolution or sweeps are not part of 3D Slash. Instead, this 3D CAD software is centered around the cuboid, a solid block that can be subdivided into smaller blocks of identical size. Just think of Minecraft, and you’ll get the idea.

Users create their 3D designs by working the cuboid with an array of tools that will not be familiar with most other 3D CAD software: hammer, trowel, chisel, pulpwood, and drill. Thus, you use the hammer tool to remove individual cubes and the trowel tool to add cubes and so forth.

3D designing with these tools is easy – even for beginners. With only a little training you can achieve impressive results like a lightsaber (see our tutorial below). Also, you can import and modify existing 3D designs. For your convenience, this free CAD software ties in with a range of online printing services and model repositories. You can also export your 3D design to STL, and print it on your 3D desktop printer.

The playful, hands-on approach will be especially gratifying for hobbyists who occasionally want to create their 3D designs without having to master the mysterious lore of conventional CAD software packages. Please be aware that the free version comes with limitations. For example, you are limited to eight colors and cannot go into a high-resolution mode.

CAD software review: 3D Slash Review: 3D Modeling Made Super Easy

Tutorial: 3D Slash Tutorial for Beginners: How to Use 3D Slash

Best free CAD software for: Hobbyists who want quick results

Where to download: 3D Slash

In a time when we expect software to intuitively anticipate our actions, the concept of writing 3D objects as code in OpenSCAD is a little daunting. To many who would like to learn OpenSCAD, this 3D CAD software remains steeped in mystery because of its seemingly arcane and idiosyncratic approach to 3D modeling.

Enter BlocksCAD, a 3D modeling software that was developed to ease kids into using OpenSCAD. With this program, anyone should be able to work with OpenSCAD. The commands denoting objects, transformations more and are represented by colorful blocks that are stacked together like LEGO bricks. Once you are satisfied with your work, you render the 3D model to inspect it. The finished design can be saved in an OpenSCAD or STL format.

Don’t get us wrong, it is still not a trivial matter to model with BlocksCAD. To create a flower pot, for example, you create two cylinders of different diameters and then link them with a subtract transformation. So the program still expects you to combine the code blocks in a sensible way. However, with this program, you can be sure to create valid OpenSCAD code, because BlocksCAD knows which code blocks are compatible with each other. Along the way, you can easily gain a grasp on OpenSCAD, as you can see the bare code and understand how the changes in your blocks affect the 3D model and the code.

Best 3D CAD software for: Kids who want to start 3D modeling – and everyone else wanting to wrap their head around OpenSCAD

Where to download: BlocksCAD

Ideal for students who are just getting into 3D modeling, Leopoly offers an easy-to-understand introduction to a rather complex art. Created by ZSpace, this free browser-based platform is meant to help train novice designers in how to create, customize, and prepare 3D models for 3D printing. In all honesty, Leopoly is more of a 3D sculpting tool than hard-nosed CAD, but for an entry-level program, it does a fine job of showing newbies what is possible in the realm of 3D creation.

Users can take a ball of clay or pre-defined shapes and modify them with a variety of tools, including sculpting, painting, embossing and more. From the Leopoly interface, the 3D models can be sent directly to the 3D printer. The platform is one of many created for educational purposes by the ZSpace team, and there’s even a curriculum to guide students through the basics of 3D modeling.

This browser-based program also offers a fully integrated library for users to browse existing projects and build upon them, as well as various customizers that make it easy to leave a personal mark on whatever you end up creating.

Best free CAD software for: Students and beginners looking to get started in the world of CAD

Where to download: Leopoly

LibreCAD is an open-source free CAD software. It contains basic tools you will need to model and modify your designs. Since LibreCAD displays only 2D views, it has a slim file size of only 30 MB. But not to worry, it can display isometric views. Though the free CAD program satisfies common drawing needs, the functionality will not overwhelm you, unlike other free CAD software. LibreCAD’s UI is uncluttered, and overall the free CAD software is suitable for beginners.

For more advanced users, there are also features of LibreCAD that make it an appealing option, aside from the fact that it’s free, of course. Because LibreCAD is open-sourced, this CAD software can be altered, adapted, and customized to fit your own 3D modeling needs. There’s also a dedicated community and extensive documentation that is welcoming to all users, giving a sense of comradery to users of all experience levels.

Tutorial: LibreCAD Tutorial for Beginners (4 Easy Steps)

Best free CAD software for: Beginner to intermediate users interested in technical designs

Where to download: LibreCAD

With a tool-set reminiscent of Minecraft, MagicaVoxel is an easy-to-use free CAD software. The smallest unit within the program is the eponymous voxel, a simple building block that can be used to create stunningly sophisticated designs.

Users will easily find their way around the clearly-arranged interface, but understanding the tools in MagicaVoxel takes some time. You choose between modes that affect the surface of a mesh, select layers or change the volume of a mesh. The consequences of these techniques are as far-reaching as many sophisticated tools in traditional 3D CAD programs because users who have taken to them no longer depend on assembling complex designs voxel by voxel, but can sketch them out quickly and efficiently.

With games like Monument Valley and Minecraft, voxel designs have become very popular. Free CAD software like MagicaVoxel is a brilliant choice for creating 3D voxel art for use in games or illustrations.

Best Free CAD Software for: Beginners to intermediate users

Where to download: MagicaVoxel

An alternative approach to traditional 3D modeling is 3D sculpting. Whereas some commercial options on the market have pretty steep learning curves, the free CAD software SculptGL will go easy on you. It includes only the basic tools necessary and gives you a feel for of the sculpting workflow. What’s more is you can have all that in the comfort of your web browser.

As in more advanced sculpting tools, the main concept is that you don’t try to create a high-resolution mesh right from the start. Instead, you build up levels of details step by step. The groundwork is always to define a basic model (arms, heads, limbs) in very broad brushes. From there you can switch to smaller brushes, and sculpt large details, pronounced fingers, even muscles, and the like. Only then should you add intricate details like wrinkles or scars using finer brushes.

This being a free CAD software, the number and complexity of objects are limited. For anyone just curious about 3D sculpting, SculptGL is a great opportunity. If you want to level up, you should give Sculptris a try.

Best free CAD software for: Beginners who want to dabble in 3D sculpting

Where to download: SculptGL

Smoothie 3D is an online 3D modeling tool designed with artists and designers in mind. After registration, users are directed to a browser-based interface that is simple and intuitive to use.

The most distinct feature found in Smoothie 3D is the ability to create a 3D object over a 2D image. In other words, users can import a picture or image and create simple 3D geometries over the 2D image. This newly created 3D object, which features the 2D image transformed into a 3D model, can be rotated, edited, and even stretched or expanded to provide a more realistic model.

Objects can be imported as OBJ or STL files and exported as an OBJ, STL or VRML 2 file.

In Smoothie 3D, models are created using primitive shapes like cubes, spheres, cylinders, cones, and text that can all be scaled to your liking. To create and combine these shapes, just click on the related item or check their tutorial for a more thorough walkthrough. More interesting or complex shapes can be achieved by applying strokes to the model. Additional features include translation and rotation in the three axes and combinations of symmetry operations.

Best free CAD software for: Beginners who want a browser-based 3D modeling tool that is easy to use and packed with advanced features, such as transforming 2D images onto 3D models

Where to download: Smoothie 3D

Now owned by Autodesk, Tinkercad is a free 3D CAD software that runs in your browser. Using basic modeling operations, Tinkercad allows you to join these primitive shapes into complex objects, as well as subtract them from one another. After mastering these basic techniques, even newbies to CAD software can produce impressive results in no time.

Moreover, Tinkercad is much more than a simple 3D modeling tool, there are other features that help bring electronics and coding into the fold. With the Codeblocks editor, for example, users can create 3D objects based on a set of instructions you define. This combination of code and design gives students and novice-level makers the ability to learn computational thinking and automation. Tinkercad also includes a circuit editor that helps users better understand electronic circuitry.

If you are looking for a tool to get your feet wet, you will love Tinkercad’s intuitive approach to common concepts and tools in the free CAD software. It also can be used for laser cutting.

Tutorials:

• How to 3D Print a Name Tag Using Tinkercad
• Homemade Astro Pi Cases Take Twitter by Storm

Best free CAD software for: Beginners trying to grasp the basic concepts of 3D modeling

Where to download: Tinkercad

Wings 3D’s major strength lies in its advanced subdivision. The intuitive user interface will make anyone a 3D modeler in no time. The right-click menus featured in the interface are context-sensitive, offering easy access to common command variations as well as descriptions of each menu option you hover over.

In addition to standard tools, the software features advanced tools like sweep, plane cut, bend, shear, and inset. The other big selling point (even though it is free) is its AutoUV facility, which allows you to export an unfolded image of your model’s surface for painting and texturing. Additional features include magnet masking, virtual mirroring for symmetrical modeling, and sculpting.

Wings 3D’s range of features is exactly right for beginners who don’t want to get overwhelmed but still want a thorough foundation in 3D modeling. At the same time, there are enough advanced features present to make this program favorable for professional users as well.

Best free CAD software for: Beginners who are getting started with 3D modeling

Where to download: Wings 3D

Antimony is the sort of free CAD software you should give a try if you need a fresh perspective on parametric 3D modeling. It’s basically the love-child of a 3D designer and a programmer.

In Antimony, every mesh is broken down into the smallest logical components, primitive shapes and transformations (boolean and other) that allow you to generate complex objects by joining or subtracting them. Unlike other similar CAD programs like OpenSCAD, which tends to frighten away beginners with long code documents, Antimony’s workflow is much more intuitive. The user connects nodes that define shapes and transformations in graphs.

The nifty modeling workflow is suitable for most experienced designers. In case the built-in shapes don’t cover all your needs, it is possible to define custom shapes. However, this is not for everyone as Antimony represents shapes with a prefix string syntax. The free CAD software is the brainchild of Matt Keeter, an engineer with the 3D printer manufacturer Formlabs.

Best Free CAD software for: Intermediate users interested in innovative parametric 3D modeling approach

Where to download: Antimony

Popular amongst the RepRap community, Art of Illusion is an open-source 3D modeling and rendering tool that is relatively easy to use while still packing an industrial punch as far as features are concerned.  The software includes subdivision surface-based modeling tools, skeleton-based animation, as well as a graphical language that enables the creation of procedural textures and materials. Ideal for both beginners and experienced users alike, this tool is intuitive and surprisingly powerful, making it comparable to commercial counterparts that typically cost a pretty penny.

Best free CAD software for: Intermediate users looking for a free alternative to 3DS-Max or Maya

Where to download: Art of Illusion

Published by an online CNC milling and 3D printing service (which is why you can order parts directly from within it), eMachineShop is a 2D/3D free CAD software. eMachineShop is comprehensive enough for advanced designers and simple enough for beginners. In terms of drawing, the free software brings all the standard features you could expect from a true-blue CAD tool, like chamfering or sheet metal bending.

However, in case you have no prior experience, use one of the handy design wizards to create flywheels, heatsinks, hex nuts, front panels, and more pre-designed parts. Plus, the free CAD software continuously analyzes your work and alerts you to impractical design features, non-manufacturable parts, and high material costs.

Best free CAD software for: Intermediate users who appreciate some assistance

Where to download: eMachineShop

Designed around parametric modeling, FreeCAD is solid free CAD software made primarily to 3D design real-life objects of any size. Its parametric modeling capability allows you to easily modify your 3D designs by going back into your model history and changing its dimensions.

Being open-source, its feature set is oriented towards the community. Be aware that FreeCAD can be overwhelming at first, but if you make an effort to dig deeper into the software, you will be rewarded with an awesome set of features.

FreeCAD offers a modular architecture that allows plugins to be mounted to the core application. It also offers a Sketcher with a constraint-solver, allowing you to sketch 2D shapes; a robot simulation to study robot movements, and a Path module dedicated to mechanical machining like milling (CAM), and it can output, display, and adjust G-code for 3D printing.

Best free CAD software for: Enthusiasts who are willing to dig into a mighty feature set

Where to download: FreeCAD

Fusion 360 is a professional 3D CAD software by Autodesk. Unlike other professional solid-body 3D modeling software, this CAD program is relatively easy to use. Still, it covers the whole process of planning, testing and executing a 3D design. It has powerful parametric tools and analytic mesh tools that are well-suited to most challenges in industrial design.

Moreover, it can simulate both the construction of the components designed as well as the stresses they will face once they are put to their use. Fusion 360 is also set apart by its sophisticated collaborative features. It supports cloud-based file sharing, version control and import/export of common CAD file types.

Beyond the surface, Fusion 360 offers much more than your average CAD software. It’s geared toward mechanical engineers, high-level students, and businesses looking to test the functionality of their 3D models, rapidly prototype and iterate them, as well as use advanced features like generative design to optimize the performance of parts.

As can be expected from a multi-faceted program, Fusion 360 has excellent support for 3D printing. CAD files can be directly imported into the Autodesk Printing Studio. Although a commercial program, Fusion 360 is effectively free CAD software for students, educators, and makers, as you can apply for a 3-year educational license. After the trial version expires, you pay a monthly or yearly subscription fee.

Tutorial: Fusion 360 Tutorial for 3D Printing – 4 Easy Steps

Best free CAD software for: Engineering and industrial design students

Where to download: Autodesk.

The self-described “Swiss Army Knife” for 3D meshes has a clear emphasis on the mechanical functionality of 3D designs. Meshmixer is designed to prepare meshes for 3D printing, for example, it is used to model solid prosthetics with mechanical parts.

This 3D modeling software provides some pretty sophisticated optimization techniques usually found in industrial-grade programs: You can slim down unwanted mass from a 3D design, and thereby reduce the cost of printing significantly. It also allows you to automatically generate joints connecting different parts into one single device.

Also, this free CAD software has repair capabilities like hollowing, scaling, and mesh simplification making it invaluable for 3D printing.

This rich feature set makes Meshmixer a tool for advanced users, but if you are looking for one of the best free CAD software tools that seamlessly blends into the Autodesk product family, look no further.

Tutorial: MeshMixer Tutorial for 3D Printing Beginners

Best free CAD software for: Intermediate users who want to quickly realize their 3D designs

Where to download: Meshmixer

QCAD is an old-school 2D CAD software that is partly inspired by AutoCAD, so it is mostly geared towards technical drawing. As the user interface is remarkably tidy, even beginners will find their way around this free CAD software quickly.

The more intuitive modeling tools found in QCAD include NURBS and Polylines. For more intricate work, you can switch into an isometric view. Other features include 35 different CAD fonts, over 40 construction tools, and more than 20 modification tools. Also, the QCAD Library browser brings you more than 5,000 CAD parts available as free add-ons (like screws and nuts).

It may look complex, but even beginners can easily acclimate to QCAD due to its intuitive interface and accessible features. Meanwhile, more advanced users will find that this 2D CAD program has plenty to offer as far as professional use is concerned. Though the free CAD software is released under an open-source license, AutoCAD DWG export is only available as a commercial plugin.

Best free CAD software for: Intermediate to advanced users focused on technical designs

Where to download: QCAD

Sculptris is a free 3D sculpting program, made by the same developers as ZBrush. It has similar, though fewer features than ZBrush, giving it a relatively quick learning curve even for beginners.

As with more advanced sculpting tools, the main concept of this free CAD software is that you don’t try to create a high-resolution mesh right from the start. Instead, you build up levels of details step by step.

If you want to get your feet wet in 3D sculpting, Sculptris is a great free CAD software option. For more ambitious sculpting projects take a look at ZBrush or Mudbox.

Best free CAD software for: Intermediate 3D sculptors who don’t want to commit yet to ZBrush or Mudbox

Where to download: Pixologic

SelfCAD is the self-proclaimed “leader in online 3D modeling and slicing software.” Indeed, this 3D CAD software packages the complete design-to-print workflow in one neatly-presented bundle. At its core, SelfCAD features a robust 3D CAD application that allows for the design of complex and 3D printable objects.

An intuitive GUI and Tinkercad-level of simplicity in the way tools work and manipulate your designs means that virtually anyone can dive in and start creating. You can also load in a 2D image to serve as a template to your workings. In addition, this 3D CAD software comes with generators, so there is no need to model complex structures like screws, nuts, and spirals from scratch.

But perhaps the defining proficiency of SelfCAD as 3D CAD software is its ability to prepare models for 3D printing, even taking the job as far as slicing and piping the G-code directly to your 3D printer.

Best 3D CAD software for: 3D printing makers looking to get up to speed with 3D design quickly

Where to download: SelfCAD

In case you always wanted to try parametric 2D/3D CAD, this free CAD software may be the one for you. SolveSpace allows you to easily modify your design by going back into your model history and changing its dimensions. Also, its modeling tools include Bezier curves and NURBS surfaces.

Another key feature is the simulation of planar or spatial linkages with a pin, ball, or slide joints. This is invaluable as it will show you possible blockages, and inconsistencies in your designs early on in the process, saving you time and reducing annoyance.

3D printing hobbyists will appreciate the built-in STL repair tool that will make your 3D models printable. This free CAD software is even able to prepare 2D G-code for waterjet machines or laser cutters. The website includes a series of readable tutorials that will ease you into using the program.

Best free CAD software for: Intermediate users with an eye on functional designs

Where to download: SolveSpace

What immediately strikes first-time users of SketchUp Free is the neat and tidy interface that is laid out upon a browser-based platform.  There are not many buttons that can distract beginners trying to understand the 3D modeling software. Thanks to the intuitive tools that allow navigating, and sculpting accurately in the 3D view, it is possible to create simple 3D printable models from scratch within the first few hours of learning.

Which is not say that SketchUp is only capable of simple 3D modeling. Since SketchUp encourages users, and third-party companies to contribute extensions – many of them free of charge – there is virtually no limit to its potential capabilities. The free CAD software also includes drawing layout functionality, and allows surface rendering in a variety of “styles.”

SketchUp users can utilize Trimble Connect, which allows them to host 3D models online, making it easy to access 3D creations remotely or collaborate with others. When you’re ready to move beyond the basics, you can remain in the SketchUp family with the paid version of SketchUp Pro, a more advanced platform that is tailored toward professional use.

Best free CAD software for: Beginners or intermediate users

Where to download: SketchUp

Vectary is a reasonably-priced and easy-to-use online 3D tool that also offers a free plan.

You can customize templates or start your own project by assembling objects from a searchable library. Vectary emphasizes user collaboration as all models are saved in the cloud and can be easily shared. You can invite others to collaborate or to view your projects and watch what friends, schoolmates or your colleagues are doing – all in real-time.

Free users can still have up to three watermarked personal projects, as well as use many features such as generative tools, advanced object lists, collections, dark mode, and an intuitive user interface. However, exporting projects is only available if you subscribe to the lite package. That being said, users can embed their 3D models for free and place them on their blog, website or client presentations. Also, students and teachers can apply for a free educational account.

Best free CAD software for: Intermediate to advanced users who need quick reiterations of their designs

Where to download: Vectary

In terms of reliability and versatility, you couldn’t ask for a better free 3D graphics software. Blender has been used by professionals for creating animated films, visual effects, art, interactive applications, video games, and 3D printed models. Blender’s dizzying array of features includes 3D modeling, UV unwrapping, texturing, raster graphics editing, rigging and skinning, fluid and smoke simulation, particle simulation, soft body simulation, sculpting, animating, match moving, camera tracking, rendering, video editing, and compositing. Also, this free software features an integrated game engine.

It is clear that such a wealth of functionality comes at a cost.

Although Blender is free, it is by no means easy to master. Regarding modeling, it is noteworthy that Blender includes sculpting capabilities similar to commercial options like Mudbox or ZBrush. This free 3D software provides many tools and modifiers that ease the creation of meshes intended for 3D printing – including a solution to repair meshes.

Blender is not suited for beginners, but if you are not turned off by a steep learning curve, and are in search for one of the best open-source, free 3D modeling software out there, this is it.

Tutorial:

• How to 3D Print Text Using Blender
• Blender: How to Merge Objects – Simply Explained
• Blender: Extrude – Simply Explained
• Blender: How to Reduce Polygons – Simply Explained
• More Blender tutorials

Best free CAD software for: Professional 3D modelers, 3D designers, and game developers

Where to download: Blender

BRL-CAD is a free open-source solid modeling program that has an interesting background. The development of BRL-CAD started in 1979 when the US Army needed a CAD system to conduct ballistic and electromagnetic analyses. However, this free CAD software is also suitable for academic, and industrial applications in automotive, mechanical parts, and architecture.

You can either model in a GUI or in the command line, something users of OpenSCAD will appreciate. The brilliant modeling system of this free CAD software is based on CSG. In the past BRL-CAD was run on supercomputers like the Cray, but today the program can run on a wide array of desktop operating systems.

Best free CAD software for: Advanced professionals interested in physical simulations

Where to download: BRL-CAD

Tailored to 3D modelers on a budget, this free CAD software features the usual CAD modeling tools. In terms of functionality, the program keeps to the conventions of CAD software. Also, the user interface is clearly inspired by AutoCAD. So, in case you’re looking for a free alternative to that specific program, it’s worth taking a closer look.

While the core features are free, additional functionality has to be bought. This concerns functions like extended import/export and rendering. Like some other programs, DesignSpark taps into online services, allowing you to download 3D models directly into the free CAD software and have your designs printed and sent to you.

Best free CAD software for: Professionals looking for an alternative to AutoCAD

Where to download: DesignSpark

How about a fresh take on 3D modeling? Houdini is procedural CAD software that is designed around a node-based workflow. Similar to parametric modeling, this allows you to alter the entire model by changing individual parameters (nodes). This feature enables users to reuse objects and makes the program stand out from competitors like 3DS Max.

Another reason why this program is an industry favorite is that it includes complex particle effects for fluids. The procedural modeling approach of Houdini allows you to quickly generate complex geometries at a consistent level of quality. From carefully sculpted terrain maps to varied spaceship corridors, almost everything can be generated efficiently. That’s why Houdini’s parametric magic – apart from being one of the best CAD software tools – is a popular tool for game development and 3D animation.

Although a free version of the CAD software (Houdini Apprentice) is available – and it has all the features of the commercial product – it has some limitations that you should be aware of. You can only render up to a resolution of 1280 x 720 pixels, third-party renderers are not enabled, and every rendered image will feature a small Houdini logo.

Best free CAD software for: Professional video game designers

Where to download: Houdini

Even in its basic version, nanoCAD is an impressive piece of free CAD software. It is yet another example of how one company did something right and inspired others to follow in its tracks: The user interface takes its cues from Autodesk’s AutoCAD, so switching from one to the other won’t be a problem.

True to its claim of professionalism, nanoCAD supports parametric modeling, which is handy as you can revisit older designs, and adapt them to new tasks in a breeze. Moreover, it can automate a great many routine tasks. Like AutoCAD, it comes with a useful spreadsheet editor.

The program’s interface is uncluttered, making it accessible for hobbyists. Still, users have a rich feature set at their disposal. The free CAD software’s functionality can be extended by various plugins. In case your projects are more demanding, you should take a look at the paid versions of nanoCAD.

Best free CAD software for: Advanced users looking for a free alternative to AutoCAD

Where to download: nanoCAD

Equipped with a feature set fitting for enterprise-grade CAD software, Onshape is, in fact, free for open-source projects. It is aimed at professional level users who want version control and collaboration tools to work in large teams. Onshape is delivered over the cloud as a service. This free CAD software works on pretty much every system you can imagine – even on iOS and Android phones.

One of the most interesting features of this free CAD software is its collaborative mode. Unlike installed CAD and PDM, Onshape gives everyone on the team instant access to the same CAD workspace and the same CAD data in one central place in the cloud. Another interesting feature is the ability to manage a master design without needing to save copies or keep track of different file versions.

Onshape does have a free plan for educators and makers, but all designs designed using a free account are open to the public.

Best free CAD software for: Professional and industrial users working in teams on open-source projects

Where to download: Onshape

Another approach to 3D modeling software is OpenSCAD, a free CAD software for creating solid CAD objects. It is not an interactive modeler, but rather a 3D compiler based on a textual description language.

An OpenSCAD document specifies geometric primitives, and defines how they are modified, and manipulated to render a 3D model. This allows you to create 3D designs, which are defined by configurable parameters or reuse code for other projects. OpenSCAD is centered around constructive solid geometry (CSG) and extrusion of 2D outlines.

Admittedly, OpenSCAD is not for everyone, there’s a steep learning curve involved with this program. But it’s a free CAD software for die-hard modeling enthusiasts who relish in seeing their code come to life on their screens and inside of the 3D printer.

Tutorials: 

• OpenSCAD Tutorial for Beginners (5 Easy Steps)
• OpenSCAD Tutorial for Advanced Users – Modules & Functions

Best free CAD software for: For diehard coders

Where to download: OpenSCAD

Learn the CAD Software Lingo!

2D vs. 3D CAD Software

The most important distinction to keep in mind is between 2D and 3D CAD software. In the old days when designers and architects stood pen in hand at the drawing board, they designed in 2D. Early CAD software emulated this, displaying only trite top, front, and side views in 2D, and some CAD programs to this day only display 2D. Believe it or not, for functional designs many designers even prefer 2D CAD. As a rule of thumb, 2D CAD software is geared towards simple technical geometry. 2D is always an abstraction of the real thing. So, it is not an ideal tool to explore many alternatives of complex designs.

This is where 3D enters the picture. Only with the advances of GPUs, 3D rendering became a commonplace feature that enabled new tools that had been impossible on the drawing board. This allowed engineers and designers to create more complex geometries. The most radical development probably is 3D sculpting. 3D CAD software enables complex technical geometry, and designs since 3D representations are less prone to misinterpretation. Also, physical simulations are easier to implement and interpret.

As 3D modeling grew out of 2D technical drawing the line between the two is often blurry, as most CAD programs feature modeling tools from both worlds. In our list, you will find the full spectrum of free CAD software!

Solid Modeling vs. Surface Modeling

Many free CAD software boast solid modeling as a key feature. What’s so solid about a computer file?

Solid models supply information on physical properties like the center of gravity, volume, and mass. The idea behind the solid model is to represent a given object completely to be able to physically manufacture it. Usually, you will start with primitive shapes (cubes, spheres, etc.) which you can add to, and subtract from to model your design.

A surface model on the other hand only consists of a wireframe, and data describing the surface. These can be free-form surfaces like Bezier curves or NURBS surfaces, and others but it contains no information on the model’s content. Surface models are sufficient for many applications, like 3D animation, graphic design, and even 3D printing.

Of course, you’re not stuck with either one or the other. Most free CAD software allows you to convert between solid, and surface 3D models.

Learn more:

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  Solid Modeling (CAD) – Simply Explained
• Don’t Miss

  Surface Modeling (CAD) – Simply Explained