Joseph Robertson
c43d541267
Follow-up to #14394, addressing @raistlin7447's review (review 5421968464) item by item, plus the tests it asked for. ## Review items 1. **Stale belt offsets after switching printers** — `PrintObject::slice()` now zeroes `m_belt_min_z`, `m_belt_global_z_offset` and `m_belt_global_xy_correction` before slicing. They were only written in belt mode, so a project switched to a normal printer (or whose tilt axis was set to None) kept the old offsets, which shifted the adaptive infill octree and the organic support layers. 2. **Blocker indexing in `TreeModelVolumes`** — a test now pins the index the support blockers land on with a raft (object layer + raft layers), including the layers just below and just above where an unshifted blocker would sit. 3. **Arrange clamp** — the final-alignment clamp in libnest2d is opt-in (`NfpPConfig::clamp_to_bin`) and arrange sets it for belt printers only. Printers with an off-centre `best_object_pos` (A1 mini, H2 family) keep their alignment; a flat-bed test pins that and the existing clamp test is now a belt test. 4. **Belt view from the file, not the preset** — `GCodeProcessor::apply_config(DynamicPrintConfig)` carries the file's belt keys (and, for a belt file, its `printable_area`/`printable_height`, which the Rev remaps need) into `export_config_for_render()`; `GCodeViewer` enables the belt view from the header tilt. A normal `.gcode` opened with a belt printer selected is no longer back-transformed, and a belt file opened on another printer brings its own tilt and remaps. 5. **Purge-prism snap vs. support-only changes** — `belt_shift_layer_grid()` also shifts `m_belt_floor_z_shift_cached` and `m_belt_global_z_offset`, so the restored floor and the organic support layers follow the snapped grid. 6. **Raft / draft shield on a belt** — `update_print_fff_config()` resets `raft_layers` and `draft_shield` with the usual warning dialog instead of only greying out the fields `Print::validate()` rejects. 7. **First-layer travel speed and second-layer temperature** — `GCodeWriter` takes a first-layer point test instead of the `FirstLayerPlane`; `GCode` installs one that goes through `on_first_layer(point)` (the belt surface, as the extrusions use), converting the writer's logical point back to the object frame. `past_first_layer_band` uses a new `belt_layer_past_first_layer_band()` on the same basis. The `FirstLayerPlane` path is kept for an explicit XY/YZ/XZ choice or a non-zero plane offset, as before. 8. **Leading-edge brim test** — `belt_brim_clip_leading_edge()` is exported and called by both the generator and the test (which also checks the kept area and the cut-beyond-region cases). 9. **phong.vs** — both `110/phong.vs` and `140/phong.vs` get `up_direction` and the `dot()` slope test, so studio lighting and realistic phong highlight overhangs with the tilt. ## Remap gating `preslice_remap_*` and `gcode_remap_*` are gated on `belt_printer` through one helper, `BeltTransformPipeline::axis_remap_enabled()`. The fields are only offered in the belt group, so a value left in a profile must not change a non-belt print. That helper is the one place to widen if a non-belt use ever needs them. ## Tests (as requested) - Belt-only keys at non-default values leave non-belt G-code unchanged. - Switching a sliced project from belt to non-belt (and to tilt axis None) matches a fresh slice. - A support-only change on a belt purge print matches a fresh slice. - Non-belt start G-code moves keep the first-layer Z in the processor. - The belt brim's segment count (not pass count) catches a band emitted twice back to back. ## One fix outside belt code The belt-to-non-belt test exposed a gap that `main` shares: `PrintObject::invalidate_step(posSlice)` re-invalidates `posSupportMaterial` but not `posSimplifySupportPath` (`invalidate_steps()` does not propagate), so after any re-slice the regenerated support paths were exported unsimplified — extra vertices and tiny `E.00001` moves. `posSimplifySupportPath` is now in that list; with it the re-sliced and fresh outputs match byte for byte (comments aside). ## Verification - `libslic3r_tests`: 1116 passed, 2 skipped. `fff_print_tests`: 351 passed (561 427 assertions). Built on Linux with GCC against OCCT 8.0.1 deps. - `scripts/clang_tidy_diff.py -p build-tidy --base eb5b9a77b9`: no findings. - The GUI files (`ConfigManipulation.cpp`, `GCodeViewer.cpp`) compile; the preview change was not exercised interactively.
OrcaSlicer: an open source Next-Gen Slicing Software for Precision 3D Prints.
Optimize your prints with ultra-fast slicing, intelligent support generation, and seamless printer compatibility—engineered for perfection.
Official links and community
Official Website:
Github Repository:
Follow us:
Join our Discord community:
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Main features
- Advanced Calibration Tools
Comprehensive suite: temperature towers, flow rate, retraction & more for optimal performance. - Precise Wall and Seam Control
Adjust outer wall spacing and apply scarf seams to enhance print accuracy. - Sandwich Mode and Polyholes Support
Use varied infill patterns and accurate hole shapes for improved clarity. - Overhang and Support Optimization
Modify geometry for printable overhangs with precise support placement. - Granular Controls and Customization
Fine-tune print speed, layer height, pressure, and temperature with precision. - Network Printer Support
Seamless integration with Klipper, PrusaLink, and OctoPrint for remote control. - Mouse Ear Brims & Adaptive Bed Mesh
Automatic brims and adaptive mesh calibration ensure consistent adhesion. - User-Friendly Interface
Intuitive drag-and-drop design with pre-made profiles for popular printers. - Open-Source & Community Driven
Regular updates fueled by continuous community contributions. - Wide Printer Compatibility
Supports a broad range of printers: Bambu Lab, Prusa, Creality, Voron, and more. - Additional features can be found in the change notes.
Wiki
The wiki aims to provide a detailed explanation of the slicer settings, including how to maximize their use and how to calibrate and set up your printer.
Download
Stable Release
📥 Download the Latest Stable Release
Visit our GitHub Releases page for the latest stable version of OrcaSlicer, recommended for most users.
Nightly Builds
🌙 Download the Latest Nightly Build
Explore the latest developments in OrcaSlicer with our nightly builds. Feedback on these versions is highly appreciated.
Belt Printer Builds
The nightly release ships two parallel builds: the standard build and a belt-printer build. Both are attached to the same release — tell them apart by the filename suffix:
- Standard — no suffix (e.g.
OrcaSlicer_Windows_Installer_x64_nightly.exe) - Belt —
_beltsuffix (e.g.OrcaSlicer_Windows_Installer_x64_nightly_belt.exe)
The _belt builds add experimental support for belt / conveyor (infinite-Z) printers, where the model is sliced against a tilted belt surface instead of a flat horizontal bed. They include ready-to-use belt printer profiles, the full belt slicing pipeline (mesh rotation and G-code transforms), belt-aware support generation, and a tilted-bed preview.
⚠️ Belt printer support is under active development and is not yet merged into
main— it currently ships only in these parallel_beltbuilds, produced from thebelt-printerbranch. See tracking PR #14394 and the original documentation in #12998.
How to install
Windows
Download the Windows Installer exe for your preferred version from the releases page. Both x64 and arm64 installers are published — pick the one matching your CPU.
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For convenience there is also a portable build available.
Troubleshooting
- If you have troubles to run the build, you might need to install following runtimes:
- MicrosoftEdgeWebView2RuntimeInstallerX64
- vcredist2019_x64
- Alternative Download Link Hosted by Microsoft
- This file may already be available on your computer if you've installed visual studio. Check the following location:
%VCINSTALLDIR%Redist\MSVC\v142
Microsoft Store
Install from the Microsoft Store when you prefer a Store-signed package (helps on Windows 11 Smart App Control).
Windows Package Manager
winget install --id=SoftFever.OrcaSlicer -e
Mac
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Download the universal DMG, which runs on both Apple Silicon and Intel Macs.
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Drag OrcaSlicer.app to Application folder.
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If you want to run a build from a PR, you also need to follow the instructions below:
Quarantine
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Option 1 (You only need to do this once. After that the app can be opened normally.):
- Step 1: Hold cmd and right click the app, from the context menu choose Open.
- Step 2: A warning window will pop up, click Open
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Option 2: Execute this command in terminal:
xattr -dr com.apple.quarantine /Applications/OrcaSlicer.app -
Option 3:
- Step 1: open the app, a warning window will pop up
- Step 2: in
System Settings->Privacy & Security, clickOpen Anyway:
- Step 1: open the app, a warning window will pop up
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Homebrew Cask
brew install --cask orcaslicer
The Homebrew cask installs the official macOS DMG from GitHub Releases.
Linux
Flathub (Recommended)
OrcaSlicer is available through FlatHub:
Install from the command line:
flatpak install flathub com.orcaslicer.OrcaSlicer
flatpak run com.orcaslicer.OrcaSlicer
It can also be installed through graphical software managers (KDE Discover, GNOME Software, etc.) when Flathub is enabled. Search for OrcaSlicer in your software center.
AppImage
AppImages are published for both x86_64 and aarch64 (ARM64). Pick the file matching your CPU — the ARM64 build has aarch64 in its name (e.g. OrcaSlicer_Linux_AppImage_Ubuntu2404_aarch64_*.AppImage).
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Download App image from the releases page.
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Double click the downloaded file to run it.
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If you run into trouble executing it, try this command in the terminal:
chmod +x /path_to_appimage/OrcaSlicer_Linux.AppImage
How to Compile
All updated build instructions for Windows, macOS, and Linux are now available on the official OrcaSlicer Wiki - How to build page.
Please refer to the wiki to ensure you're following the latest and most accurate steps for your platform.
Klipper Note
If you're running Klipper, it's recommended to add the following configuration to your printer.cfg file.
# Enable object exclusion
[exclude_object]
# Enable arcs support
[gcode_arcs]
resolution: 0.1
Supports
OrcaSlicer is an open-source project, and we're deeply grateful to all our sponsors and backers.
Their generous support helps fund filaments and other essential 3D printing materials for the project.
Thank you! :)
Sponsors
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Backers:
Ko-fi supporters ☕: Backers list
Support the project
Some Background
Open-source slicing has always been built on a tradition of collaboration and attribution. Slic3r, created by Alessandro Ranellucci and the RepRap community, laid the foundation. PrusaSlicer by Prusa Research built on Slic3r and acknowledged that heritage. Bambu Studio in turn forked from PrusaSlicer, and SuperSlicer by @supermerill extended PrusaSlicer with community-driven enhancements. Each project carried the work of its predecessors forward, crediting those who came before.
OrcaSlicer began in that same spirit, drawing from BambuStudio, PrusaSlicer, and ideas inspired by CuraSlicer and SuperSlicer. But it has since grown far beyond its origins. Through relentless innovation — introducing advanced calibration tools, precise wall and seam control, tree supports, adaptive slicing, and hundreds of other features — OrcaSlicer has become the most widely used and actively developed open-source slicer in the 3D printing community. Many of its innovations have been adopted by other slicers, making it a driving force for the entire industry.
The OrcaSlicer logo was designed by community member Justin Levine.
License
- OrcaSlicer is licensed under the GNU Affero General Public License, version 3.
- The GNU Affero General Public License, version 3 ensures that if you use any part of this software in any way (even behind a web server), your software must be released under the same license.
- OrcaSlicer includes a pressure advance calibration pattern test adapted from Andrew Ellis' generator, which is licensed under GNU General Public License, version 3. Ellis' generator is itself adapted from a generator developed by Sineos for Marlin, which is licensed under GNU General Public License, version 3.
- The Bambu networking plugin is based on non-free libraries from BambuLab. It is optional to the OrcaSlicer and provides extended functionalities for Bambulab printer users.