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PrusaSlicer

PrusaSlicer 2.9.4-rc1

Official release record for PrusaSlicer 2.9.4-rc1, published Nov 4, 2025.

Pre-release2 public packages3,675 recorded GitHub downloads

Official files in this release

macOS · 1 files

  • PrusaSlicer-2.9.4-rc1.dmgNot specified in filename · 143.6 MiB · 799 downloads
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Not specified · 1 files

  • PrusaSlicer-2.9.4-rc1.zipNot specified in filename · 98.9 MiB · 2,876 downloads
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Package changes from the previous release

Compared with 2.9.3, all classified package counts remain unchanged at 2 public files.

Release channel: Stable → Pre-release.

Counts are separate views of publisher filenames by platform, processor and format. They are not compatibility or support guarantees.

Release-note preview

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PrusaSlicer

Summary

This is the first release candidate of PrusaSlicer 2.9.4. This release focuses on the integration of Junction Deviation for Marlin 2 firmware. The Junction Deviation feature improves motion planning around the corners of an object, reducing printing time while maintaining surface quality.

The release candidate saves its profiles into the regular PrusaSlicer configuration directory. When you first run it, it will search for all configurations produced by alpha or beta versions and offer to create a copy of the latest one.

Junction Deviation Integration and Improved Time Estimation

This release integrates full support for Junction Deviation (JD) for Marlin 2 firmware. A new Junction Deviation setting (Printer Settings -> Machine Limits > machinemaxjunctiondeviation) will automatically output the M205 J G-code. The internal Time Estimator and G-code Viewer have been updated to simulate the JD algorithm, providing significantly more accurate time estimates and realistic speed visualizations. Note: If machinemaxjunctiondeviation is set to 0, the classic Jerk logic will be used for calculations, and the JD feature will be disabled. Junction Deviation (JD) is now enabled by default for the CORE One L.

This begins the phased rollout of JD for other printers with future profile updates.

ActualSpeedJD_Jerk

Bugs fixed

  • Fixed an Arachne bug where the simplification of closed extrusion paths could produce extremely small G-code segments, which could lead to visible print artifacts on curved surfaces. The issue was originally investigated by @sethml in #11811. This fix was ported from OrcaSlicer. Fixes #11807 and #11573. Thanks to @sethml and @Noisyfox.

Translations

  • Updated POT.
  • Update CS, DE, ES, FR, IT, JA, PL dictionaries.
Official release ↗