packerlschupfer
d59155b27f
* Moonraker: pass print=true in upload — fixes Upload & Print race with power-on-upload Closes #14945. Upload & Print on the Moonraker (Klipper) host type failed with HTTP 503 "Klippy Host not connected" on any printer that Moonraker powers up in response to an upload (the [power] on_when_upload_queued feature). The file landed on disk, the print never started, and the user hit an error dialog. Root cause: after POST /server/files/upload succeeds we immediately fire POST /printer/print/start. On a cold printer that Moonraker just powered up, Klippy is still coming up when /printer/print/start arrives, so Moonraker returns 503. Fix: add `print=true` to the upload multipart form. Moonraker's own upload endpoint queues the print inside the upload response — and when a [power] device with on_when_upload_queued is configured, it powers the printer on and waits for Klippy READY before starting. That's the whole point of the power-on-upload feature; our second POST was defeating it. Also read `result.print_started` from the upload response — when true, skip our explicit /printer/print/start (Moonraker handled it); when false (older Moonraker or buddy-fork that ignores the print flag), fall back to the explicit call so the existing behaviour is preserved for those servers. Reporter and root-cause identification: @RubenOllesch. (cherry picked from commitbd442155ba) * Moonraker: treat print_queued as Moonraker owning the print Reading only result.print_started missed the exact case this PR set out to fix. Moonraker's upload response carries two flags: print_started : it began the print immediately print_queued : it accepted the job but has not started it yet The power-on path (`[power] on_when_upload_queued`) is the second one: Moonraker queues the job, powers the printer up and waits for Klippy to report READY, so it answers print_started=false, print_queued=true. With only print_started read, moonraker_started_print stayed false, the fallback fired, and our explicit /printer/print/start hit the same not-ready Klippy that produced the original 503 — i.e. the fix did not fix #14945 for the configuration that reported it. Verified the response schema against Moonraker v0.11.0 (API 1.5.0); an upload with print=true on a ready printer returns: {"action": "create_file", "item": {...}, "print_started": true, "print_queued": false} Both fields are present, so reading print_queued is safe on this version and the `false` default keeps older hosts on the existing fallback path. Caught by @raistlin7447 in review of #15032; the fix is their suggestion. (cherry picked from commit43e8eff003) * Moonraker: read the upload reply's fields at top level Moonraker's FileUploadHandler writes the upload result straight to the response instead of wrapping it in {"result": ...} like the endpoints registered through register_endpoint. item.path, print_started and print_queued are therefore top-level keys. Reading them under result. silently fell back to the local filename and to "not started", so the explicit /printer/print/start still ran after every upload. Also correct the comments on when Moonraker queues a job instead of starting it, and on what it renames on upload.
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. - Belt Printer Support
Slice for belt / conveyor (infinite-Z) printers, with belt-aware supports and a tilted-bed preview. Contributed by Joseph Robertson (@HarrierPigeon). - 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.
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.