3D printing, like everything else on Earth, is limited by gravity. Despite its amazing ability to turn spools of plastic into action figures, epic swords, and other fun models, 3D printers don’t print well over thin air.
To combat this problem, slicer software can add all sorts of 3D printed supports to hold up your model as it prints. Once the whole thing is printed, the supports can be removed, though they can leave their mark on the surface of your part.
In this article, we’ll go over the three main steps to follow when deciding whether and how to add supports to your model. We’ll look at the options, using Cura slicer settings as an example, though similar settings will be available in most slicers. Let’s get to it!
Not every 3D print requires supports, which is something to keep in mind when preparing a model. A major aspect of supports is knowing how to avoid them, as they contribute to waste and can affect the surface of your printed part.
Here’s how to know whether your model needs supports:
As they say, prevention is better than cure. Here are some general guidelines to avoid having to print with supports:
If you’re sure supports are necessary, you can simply check the “Generate Support” box in Cura (or your preferred slicer) and call it a day. Yet, since there are so many ways to 3D print supports, it could be worth digging deeper into the settings.
Lattice supports are the most common type. They’re popular because they’re easy to customize, quick to generate, and work well for most 3D models. The downside is, if not printed properly, the supports can leave marks on the finished model and be a pain to remove. In general, you should use lattice supports for flat, angular, or very steep overhangs.
In Cura, if you can’t see the “Support Pattern” option under the Support menu, adjust your settings visibility to “Advanced” or higher. Then, use the dropdown to select your preferred support pattern. You can toggle between X-Ray and Layer view in the preview to see what it looks like.
The default support type in Cura is Zig Zag, which is reasonable because it’s easy to print and remove. However, there are actually seven support patterns under the hood to choose from (some of which are pictured above). Make sure to pick a support pattern that fits your model’s shape. Concentric, for example, is useful for parts with circular overhangs (like a sphere), which aren’t supported evenly by a grid.
Tree-type supports are almost exactly what they sound like. They start from “trunks” near the base of a print and branch out to support overhangs in the model as height increases. Tree supports are typically most effective for organic shapes, like humans and animals.
3D printing these supports can save on material and print time. In Cura, select tree support using the “Support Structure” dropdown. Make sure your model is properly positioned and oriented before you hit “Slice”, as they can take a long time to generate!
Since tree-type supports don’t touch the model as much, they generally offer a cleaner surface finish. However, they can take a long time to slice, since the trees are generated dynamically. Pick these supports if your model has lots of organic shapes or overhangs that are small or not very steep (less than 60°). These supports are less effective for wide, flat overhangs, such as a roof, since they’re designed to touch the model at fewer points.
This is a niche but high-quality alternative to supports printed in the same material as the model. For example, with a dual extruder printer, one nozzle can print a model in PLA while another prints all the support material in a water-soluble filament (commonly PVA). When the 3D print finishes, simply soak the print in some water. The supports will dissolve, leaving a clean model behind. How cool is that?
If you’re lucky enough to own a dual extruder printer and don’t mind paying for some slightly pricey filament, we definitely recommend this option.
The next step is to decide the best density at which to 3D print supports. We recommend starting at a density of about 10% and then adjusting to your liking. To see your sliced supports in Cura, select “Layer view” in the Preview tab and ensure “Helpers” are checked in the color scheme. Here are some factors that affect support density:
Cura has plenty of other settings to fiddle with so you can perfect your print. You might never need to touch these settings, but it’s always good to know they’re there.
License: The text of "3D Printing Supports: 3 Simple Steps to Success" by All3DP is licensed under a Creative Commons Attribution 4.0 International License.