Tommaso Bianchi
8f3f835636
Five defects from ten minutes of real use, and the mode split behind the worst of them. One commit because the changes overlap in the same functions; the pieces are separable in the diff, not in the file. CONSTRAINING NO LONGER NEEDS A COMMITTED SKETCH. A constraint could only be applied by committing the sketch, selecting it in the feature tree, pressing the padlock, and only then picking. While drawing, the CONSTRAIN toolbar was not even on screen (set_ui_mode showed it in UiMode::Constrain alone) and apply_constraint answered "Press Constrain on a sketch first" -- in a status line nobody looks at. Draw two lines, press Parallel, get nothing: that is what a user reported as "the UX is a mess", and they were right. apply_constraint now takes the live session first, reading the picks from the selection model the sketch tool already had (click, ctrl-click to extend, double-click for the loop) and applying through try_add_constraints, which already did append -> solve -> keep-or-rollback. The committed Constrain path stays for editing an old sketch; it is no longer the only way in. The twenty constraint buttons now show in Sketch mode as well. The discriminator is is_sketching() && !is_constraining() && !is_constraining_entities(). Both begin_constrain and begin_constrain_entities set m_active, so is_sketching() alone is true DURING a constrain session and the new path would hijack the old one -- compiling perfectly and failing in behaviour. ONE PLANNER, NOT TWO. A second caller meant duplicating the logic that decides whether a constraint is legal, which roles it binds and whether it needs a typed value. That duplication is how today's Coincident bug survived: fixed in one branch, alive in the next one down. plan_entity_constraint() now lives in the kernel -- pure, no wx, no translation -- and both UI paths call it. DesignPanel loses 304 lines and gains 155. Being in the kernel makes it TESTABLE. The Parallel defect existed because a constraint type met an entity type nobody had tried, and the only instrument was a 13-minute GUI ladder. 19 new kernel cases cover the matrix: 264 -> 283 cases, 7648 -> 7867 assertions. Parallel, Perpendicular and EqualLength gain the two-line guard they never had. On non-lines they used to emit a def the solver silently dropped -- the sketch reported itself constrained when it was not, the same class as Horizontal on a Point. EqualLength on two rounds still promotes to EqualRadius first. Symmetric is planned completely, including its axis pick: the plan carries a VECTOR of defs because Symmetric on two lines is two constraints (P0/P0 and P1/P1). A single def would have half-applied it -- one end pinned, one free, looking correct until something moves. A PLACED POINT SURVIVES THE COMMIT. Type::Point was created correctly and never drawn once committed: both renderers skip it, correctly, since entity_polyline gives a point nothing. What was missing is the vertex-marker path the live session already used. rung_point passed throughout because it asserts the document, and the point was always in the document -- the pixels lied. ESC STOPS EATING AN UNSAVED SKETCH. The third press reached cancel_sketch(), clearing m_entities with no warning and nothing to undo. live_sketch_has_work() existed and was never consulted. The exit layer refuses once when there is work and lets a second consecutive Esc through; the refusal re-arms on a button press, never on mouse motion, or Esc could never exit while the hand moves. TWO NEW RUNGS. D10 drives Parallel through the committed path -- it passes on the PRE-fix binary, which is how we know the user's failure was the mode and not the constraint. D11 is the acceptance for the collapse: draw, pick both, press Parallel, no commit and no padlock. Ladder 126 -> 135 properties, all holding. CON_BTN_SKETCH is measured, not derived: in Sketch mode the group renders after the sketch toolbar, so the first button is at 677, not 449. Pitch 42, twenty buttons, read off a screenshot. Deriving it by offset is how that table drifted the last time. Known limit, commented at the call site: a constraint added to a LIVE sketch is not on the document undo stack, so Ctrl+Z will not take it back until the sketch is committed. snaporca-itp4, snaporca-oyhx, snaporca-l2vm
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.