OrcaSlicer 2.3.1-alpha

OrcaSlicer V2.3.1-alpha Release Notes

OrcaSlicer V2.3.1-alpha is a comprehensive update focused on infill, surface control, motion tuning, and workflow polish. In this release we’re introducing a template-based sparse infill rotation system; two new fuzzy skin features—fuzzy skin (extrusion mode) and fuzzy skin painting; improved flow rate calibration; and built-in Input Shaping and Junction Deviation calibration. Multi-material printing gains color remapping and a sturdier RIB wipe tower. You’ll also see UI refinements, performance improvements, and broader printer support, including the latest BambuLab firmware and AMS 2/HT.

Below is the full changelog—thanks to everyone who tested builds and contributed PRs.

🎯 New Features and Enhancements

• New sparse infill rotation system by @SoftFever and @pi-squared-studio in #9924 and #9996

OrcaSlicer now allows you to specify Sparse Infill's rotation pattern in any possible way by using the newly introduced template meta-language(kudos to @pi-squared-studio)

If you want to learn more about the new rotation system, please visit our WIKI: infill_rotation_template ↗ for detailed documentation.

• Infill Line Multiplier by @RF47 and @profOnno in github.com/SoftFever/OrcaSlicer/pull/9432 ↗ — We're introducing the new Infill Line Multiplier feature, giving you greater control over your print's internal structure.

This option lets you multiply the number of infill lines while preserving your chosen infill density, providing more flexibility to balance strength and material distribution.

By increasing rigidity and fine-tuning material usage, you can create complex, customized internal structures tailored to your printing needs—while maintaining consistent cross-sectional weight.

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• Improve flow rate calibration: use ipArchimedeanChords pattern for flow rate calibration by @SoftFever and @Noisyfox in github.com/SoftFever/OrcaSlicer/pull/8993 ↗

The surface pattern and printing sequence in OrcaSlicer’s flow rate calibration test have been redesigned for improved accuracy. You can now identify the correct block not only by visual inspection but also by feeling for the smoothest surface at the ring, making it easier to determine the most accurate flow rate. image

This method is inspired by jimcorner ↗

• New calibration- Input Shaping & Junction Deviation by @ianalexis and @RF47 in github.com/SoftFever/OrcaSlicer/pull/9160 ↗

OrcaSlicer now introduces comprehensive input shaping and junction deviation calibration tools to optimize motion control on Marlin 2 and Klipper-based printers. Through a two-step calibration process—first identifying the optimal input shaping frequency, then fine-tuning damping ratios—users can significantly reduce ghosting and vibration artifacts. With support for Marlin’s M593 G-code and initial Klipper compatibility, the feature provides granular control, a dedicated calibration UI, and has been validated across a wide range of machines from Ender-3 class printers to high-performance models like the Voron 2.4 and FLSun T1 Pro.

By building on proven resonance compensation techniques from Klipper, OrcaSlicer makes advanced motion tuning accessible to more printers, enabling cleaner, higher-quality prints. imagen imagen imagen imagen imagen imagen imagen imagen

• Feature: Fuzzy Skin Extrusion Mode by @pi-squared-studio in github.com/SoftFever/OrcaSlicer/pull/9878 ↗

Now OrcaSlicer implement a novel way fuzzy skin! Instead of creating jagged tool path to create fuzzy skin effect. This new approach create fuzzy skin effect by simply alter extrusion(flow). fuzzy

• Add fuzzy skin painting by @Noisyfox in github.com/SoftFever/OrcaSlicer/pull/9979 ↗

Ported from PrusaSlicer by @Noisyfox, we can now paint the areas we want to apply the fuzzy skin. This new paint-on fuzzy skin feature lets you brush texture directly onto chosen surfaces, giving precise control over where the rough, randomized finish appears. It’s ideal for adding grip, decoration, or selective surface detail without affecting the entire print.

• Introduce a new seam alignment option: Aligned back by @SoftFever in github.com/SoftFever/OrcaSlicer/pull/10255 ↗

We’ve added a new option for seam placement to improve print aesthetics on front-facing models, such as sculptures or designs with a clear viewing direction.

Previously, using the Aligned seam option could result in seams being placed at the front, which is often undesirable. The new option prioritizes placing seams away from the front while still searching for optimal hidden positions on other sides.

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image image Unlike the Back option, which always forces seams to the backmost position, this approach provides a more balanced and visually pleasing result. You can see the difference in below video:

image

• Remap filament for pre-colored models by @SoftFever in github.com/SoftFever/OrcaSlicer/pull/10303 ↗

This release introduces an intuitive color remapping feature that addresses a common workflow challenge when printing pre-colored models. Users can now easily adjust filament assignments when a model's built-in color sequence doesn't match their printer's loaded filament order, eliminating the need to physically rearrange filaments or modify the original model files. This is particularly useful when working with pre-painted models where the artist's intended color order differs from your current extruder setup.