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You’re Finished

PrusaSlicer’s Latest Update: To Deliver Visually Flawless 3D Prints on Core One & XL

by Jonny Edge
Published Sep 2, 2025

The latest update to PrusaSlicer promises to banish VFAs from your new Prusa, and the improvements can be seen with almost any other printer too.

Prusa Research has been busy hammering out the issue of VFAs, or Vertical Fine Artifacts, over the past couple of months after users of the Core One (and other printers) expressed frustration over the visual blight they can cause.

According to founder Josef Průša’s latest article, that chapter is now at a close and an entirely open-source solution has been developed. The result is PrusaSlicer Beta 2.9.3, an update to the slicer that brings two new features and improved print profiles – resulting in drastically improved surface quality for your prints.

Skill with Infill

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VFAs are consistent, undesirable visual flaws that manifest in prints at the same place in each layer due to the way slicer software handles cooling slowdowns and small movements. The new “Consistent Surface” feature found in the new release alters the cooling slowdowns to focus on less visible regions such as infill. This allows for consistent speeds to be achieved on the visible areas of the print, and a far more uniform finish as a result.

Ghosting has also been a focus, and the new update includes a feature that uses gentler acceleration during the minute movements between perimeters. This reduces micro-vibrations that cause ringing artifacts, which in turn helps prints produce sharper, more consistent corners.

Although the Core One has been targeted specifically for these fixes, during testing Prusa Research found that the benefits provided by these new features also applied to the XL and MK4/S, as well as almost any other printer using PrusaSlicer.

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Previously, PrusaSlicer’s Core One print profiles “Speed” and “Structural” were the main focus. Version 2.9.3 introduces a new profile for the Core One called “Balanced” though, which aims to offer the benefits both profiles present, but without the drawbacks associated with them. In theory, the new Balanced profile should give you good surface quality and good durability, instead of sacrificing one quality in one for the benefit of the other.

Lastly, a new manual belt tensioning system has been devised that gives users much greater control. A new tuning procedure (enhanced in the Prusa app) will also count towards improved surface quality, and is a key part of this update – even if it isn’t software-based.

Průša’s full article can be found here, and if you’ve been playing with the new Beta release and getting some good results, we want to hear from you! Let us know your experience so far in the comments below.