OrcaSlicer 2.4.0-beta

What's Changed

This is the OrcaSlicer V2.4.0 Beta. A lot of effort has gone into this release to improve stability, speed, and print quality, along with the interface and printer support. Bridging in particular has been greatly improved by @ianalexis, @kisslorand, and many others, and a new realistic rendering option from @RF47 makes your models look gorgeous right inside OrcaSlicer.

There's good news for multi-material users too: per-feature filament assignment got a big upgrade, opening up much more creative prints. Ever thought about printing the outer walls in TPU and the rest in PLA? Now you can — check out the details below.

Note: Everything from the 2.4.0 Alpha — Orca Cloud, Z Anti-Aliasing (ZAA) contouring, Machine Input Shaping, Optimized Gyroid infill, and the redesigned printer selection dialog — is included in this build. See the 2.4.0 Alpha release notes ↗ for details on those.

🌊 New Features & Improvements

• Realistic View: Phong shading, ambient occlusion, and cast shadows by @RF47 in 13704 ↗ — Adds a new set of rendering options to the 3D canvas, letting you switch between the classic Gouraud shader and a new Phong shader and layer on SSAO ambient occlusion and cast shadows. The result is a far more realistic, depth-rich preview of your models. Reflections (Phong) and cast shadows are available in prepare mode.

| Gouraud | Gouraud + SSAO | Gouraud + SSAO + Shadows | | | | |

| Phong | Phong + SSAO | Phong + SSAO + Cast Shadows | | | | |

Reflections menu

• Configurable lightning infill angles by @RF47 in 13848 ↗, with wiki documentation by @ianalexis in 13984 ↗ — Exposes three new expert-mode settings for lightning infill: the overhang angle (how far walls can support the layer above), the prune angle (how aggressively short unsupported branches are removed), and the straightening angle (how far branches can be simplified). These give finer control over how lightning infill is generated. Fixes #13758.

Lightning infill angle settings

| Overhang | Prune | Straightening | | | | |

• Double-click an object list row to frame it in the 3D view by @RJAudas in 13804 ↗ — Adds Blender-style "Frame Selected" behavior to the object list: double-clicking an object, part, or instance row in the left panel now frames that item in the 3D view while preserving the current view angle. It is the same camera move as the existing "Fit camera to scene or selected object" toolbar button, just exposed through a more natural trigger. The action is inert in slice-preview mode. Resolves #13800.

Before:

github.com/user-attachments/assets/02b4e58e-2f49-4ffa-aa10-125e6bd2d91c ↗

After:

github.com/user-attachments/assets/a4a4c96d-356b-4797-8cff-7fd96ba61753 ↗

• Preview sliders overhaul by @kisslorand in 13919 ↗ — A comprehensive refresh of the layer preview sliders. The layer labels next to the vertical slider are now fully interactive — you can click and drag them directly for a much larger interaction target, they highlight on hover, and clicking preserves the current position instead of jumping. Both vertical and horizontal sliders received a cleaner visual style with clearer borders, subtle shadows, and consistent accent styling, and single-layer preview now matches multi-layer preview for smoother transitions.

github.com/user-attachments/assets/2e5931a0-ec05-4a13-bef2-1602b20934f7 ↗

• Troubleshoot Center by @yw4z in 12416 ↗ — Adds a new Troubleshoot Center, accessible from the Help menu, that gathers everything needed to diagnose problems in one place. It can save logs as a zip, set the log level, and copy auto-formatted system information (OS, CPU, RAM, GPU, monitors with resolution and scaling) ready to paste into a GitHub report. It also includes a profiles overview with enabled/total/user stats and a "Rebuild" button that safely clears the cached profiles folder and relaunches Orca. No user-specific information is collected, and system specs can be hidden before taking a screenshot.

Troubleshoot Center

• Hide unsupported presets in the preset dropdown by @Noisyfox in 13959 ↗ — Unsupported presets are no longer shown in the preset combo boxes by default, keeping the dropdown lists focused on presets that actually apply to your setup. This also makes switching printers noticeably faster, especially if you have a large number of filament profiles. A developer setting can show unsupported presets again if needed.

• Disable "Slow down for curled perimeters" by default and clarify its tooltip by @igiannakas and @ianalexis in 13870 ↗ and 13918 ↗ — This setting (ported from PrusaSlicer to help printers with weak part cooling avoid upward curling at sharp overhangs) is now off by default, because at today's faster print speeds it can cause wall-consistency artifacts unless pressure advance is carefully tuned. The tooltip was expanded with tuning recommendations so users who still want it know what to adjust. Printer profiles that explicitly enable it are unaffected.