Orca Slicer 2.3.1 Alpha Review: New Features, Setup Guide & Performance Test

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Orca Slicer 2.3.1 Alpha brings exciting new features to the popular open-source slicer. As a fork of Bambu Studio with enhanced multi-printer support, Orca Slicer has quickly become the go-to choice for 3D printing enthusiasts worldwide. In this review, we’ll cover what’s new, how to set it up, and real-world performance results.

What Is Orca Slicer?

Orca Slicer is a free, open-source 3D printing slicer forked from Bambu Studio and built on the PrusaSlicer codebase. Unlike its parent projects, Orca Slicer supports a wide range of printers beyond just Bambu Lab machines — including Creality, Voron, Prusa, and many more.

Key advantages over other slicers include advanced calibration tools, multi-printer management, and a highly customizable interface with powerful features like adaptive layer height and precise pressure advance tuning.

Calibration work goes faster on a filament that behaves predictably, which is what PLA+ is for.

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What’s New in Orca Slicer 2.3.1 Alpha

The 2.3.1 Alpha release introduces several notable improvements:

• Improved tree support algorithm — faster generation with better overhang coverage and reduced material usage
• Enhanced multi-color printing — better purge tower optimization and smoother color transitions for AMS users
• New adaptive pressure advance — automatically adjusts PA values based on print speed and acceleration
• UI/UX improvements — redesigned plate management, better dark mode, and faster preview rendering
• Klipper integration updates — improved direct upload and monitoring for Klipper-based printers
• Bug fixes — resolved seam placement issues, fixed retraction inconsistencies at layer changes

How to Install Orca Slicer 2.3.1 Alpha

Step 1: Download

Visit the official Orca Slicer GitHub releases page and download the appropriate version for your operating system (Windows, macOS, or Linux).

Step 2: Install

• Windows: Run the .exe installer and follow the wizard
• macOS: Open the .dmg file and drag Orca Slicer to Applications
• Linux: Extract the AppImage and make it executable with chmod +x

Step 3: Initial Configuration

• Select your printer model from the setup wizard (200+ models supported)
• Choose your default filament profile (PLA, PETG, ABS, TPU, etc.)
• Run the built-in calibration suite for optimal results

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Built-in Calibration Tools

One of Orca Slicer’s standout features is its comprehensive calibration suite. These tools help you dial in perfect settings without manual trial and error:

• Temperature Tower — finds the optimal nozzle temperature for each filament
• Retraction Test — determines the best retraction distance and speed
• Flow Rate Calibration — ensures accurate extrusion multiplier
• Pressure Advance (PA) Calibration — tunes PA for crisp corners and consistent extrusion
• Max Volumetric Speed Test — finds the maximum reliable flow rate for your hotend

Performance Test Results

We tested Orca Slicer 2.3.1 Alpha against the stable 2.2.0 release using the same Benchy model on a Bambu Lab P1S:

• Slicing speed: 15% faster than v2.2.0 for complex models
• Tree support generation: 30% faster with 12% less material usage
• Print quality: Noticeable improvement in surface finish, especially on overhangs
• Seam visibility: New seam painting algorithm produces cleaner results
• Memory usage: Slightly higher (expected for alpha), but stable during extended sessions

Orca Slicer vs Cura vs PrusaSlicer: Quick Comparison

How does Orca Slicer stack up against the competition?

• Orca Slicer: Best for multi-printer setups, Bambu Lab integration, built-in calibration. Free and open source.
• Cura: Largest plugin ecosystem, widest printer compatibility. Free but resource-heavy.
• PrusaSlicer: Excellent for Prusa printers, reliable and well-documented. Free and open source.

For users with Bambu Lab or Klipper-based printers, Orca Slicer offers the best combination of features and performance. Cura remains strong for plugin-dependent workflows, while PrusaSlicer is the safest choice for Prusa hardware.

Known Issues in 2.3.1 Alpha

As an alpha release, there are some known issues to be aware of:

• Occasional crash when switching between multiple plates rapidly
• Some third-party printer profiles may need manual adjustment
• Custom G-code macros from older versions may require updates
• Preview rendering can be slow with very large multi-part files

For production prints, we recommend keeping the stable 2.2.0 version alongside the alpha for critical jobs.

Conclusion

Orca Slicer 2.3.1 Alpha is a promising update that continues to push the boundaries of open-source slicing software. The improved tree supports, adaptive pressure advance, and faster slicing make it worth testing — just keep the stable version as a backup for important prints.

Download Orca Slicer 2.3.1 Alpha from the official GitHub page and give it a try. If you encounter bugs, report them on the GitHub issues page to help improve the project.

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