Orca Slicer for Beginners: Setup and First Slice

OrcaSlicer is a free, open source slicer for FDM printers. It works with Bambu Lab, Prusa, Creality, Voron and many other machines, and it adds built-in calibration tools on top of a familiar slicer layout. This guide covers downloading it safely, the three kinds of settings, the beginner option mode, a first slice and the calibration order the project recommends. It is desk research from the OrcaSlicer README and wiki, so values are starting points, not tested results. New to slicing? Read what a slicer is first.

1. Download the real OrcaSlicer

The project README warns that clickbait and malicious sites imitate it, naming orca-slicer[.]com and orcaslicer[.]net, and says the only official website is www.orcaslicer.com. Downloads are published on the GitHub releases page. The latest release at the time of checking (2026-10-10) is v2.4.2, dated 2026-07-07. Available files include:

• Windows: installers for x64 and arm64, plus portable zip builds
• macOS: a universal DMG that runs on Apple silicon and Intel Macs
• Linux: AppImage builds for x86_64 and aarch64, plus Flatpak files

The README also lists install routes through the Microsoft Store, winget, Homebrew cask and Flathub. OrcaSlicer is licensed AGPL-3.0, and Wikipedia describes it as a fork of Bambu Studio. On macOS, the README includes steps for opening an unsigned build if a security warning appears.

2. Understand printer, filament and process settings

The wiki groups settings into three areas: printer settings (hardware such as printable space and retraction), material settings (temperatures, flow ratio, cooling) and process settings (quality, strength, speed, support and other print options). When you pick a printer profile, OrcaSlicer loads matching presets for all three. Choose the one that matches your printer and nozzle first, then the filament, then the quality preset.

The README says the program ships with pre-made profiles for popular printers. If your machine is missing, check for a profile from your printer maker or start from a similar printer and edit the printable space and nozzle size.

3. Use Simple mode at first

OrcaSlicer has four option visibility modes. According to the wiki:

• Simple shows only essential settings, and is described as ideal for beginners.
• Advanced adds common fine-tuning options.
• Expert reveals experimental and advanced options that need deeper knowledge.
• Developer exposes every setting, including hidden ones, and is enabled in Preferences.

Stay in Simple until you know what you want to change. Each setting page in the wiki lists its mode, so you can see where a setting sits.

4. Import a model and slice

1. Add the model. Use the Add button in the toolbar, choose File, then Import, or drag and drop the file into the window. Supported types are 3MF, STEP, STL, SVG, OBJ and AMF. Our guide to STL, 3MF and G-code explains the differences.
2. Check printer, filament and process presets against your hardware and spool.
3. Set layer height. The wiki says the optimal range is usually 20% to 80% of the nozzle diameter. For a 0.4 mm nozzle, its quick-reference table gives a minimum of 0.08 mm and a maximum of 0.32 mm, and recommends a 0.25 mm first layer. More layer height detail is in layer height explained.
4. Add supports or a brim only if needed. Brim is a flat layer around the base for models with small footprints or prone to warping, and the wiki has an Auto type that calculates a width. See brim vs raft vs skirt and supports explained.
5. Slice, then use the preview to check the first layer and any overhangs.
6. Print. Send the file to the printer or export it, depending on your machine.

The README lists network support for Klipper, PrusaLink and OctoPrint for remote control. To follow a full print from start to finish, see how to 3D print.

5. Use the built-in calibration tools

One reason people choose OrcaSlicer is its Calibration section. The wiki's calibration guide recommends this order:

1. Temperature
2. Max volumetric speed
3. Pressure advance (adaptive pressure advance is an advanced option)
4. Flow
5. Retraction, after flow and pressure advance
6. Cornering
7. Input shaping
8. VFA, to find resonance speeds
9. Tolerance

Start with the temperature tower. It is a vertical tower of blocks printed at different temperatures. The wiki says to pick the temperature that gives the best print with the fewest issues, to use the middle of a good range, and to lean toward the higher end if you plan to print faster. Lower temperatures typically reduce stringing, and higher temperatures generally improve layer adhesion. After calibrating, the wiki says to create a new project to exit calibration mode.

You do not need every calibration on day one. A temperature tower and a flow test cover a lot, and our guide to retraction settings adds context.

6. Klipper owners: add two config lines

The README recommends adding the following to printer.cfg on Klipper: an [exclude_object] section to enable object exclusion, and a [gcode_arcs] section to enable arc support. Check the README for the full snippet.

7. Back up your profiles

The wiki says OrcaSlicer stores user profiles in its configuration directory, for example %APPDATA%\OrcaSlicer on Windows and ~/Library/Application Support/OrcaSlicer on macOS. Uninstalling does not delete them, but on macOS the uninstaller may offer to delete the folder, and the wiki warns that confirming loses your profiles permanently. Copy the folder before major changes.