slic3r/Slic3r

Health v2 · maintenance only

Adoption not part of the score

3650 stars · 1317 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Slic3r is an open-source toolpath generator (slicer) for 3D printers that converts 3D models (STL, OBJ, AMF, 3MF) into G-code instructions. It ships as a desktop GUI application, a command-line tool for batch processing, and libslic3r, a reusable C++ library.

Use cases

• convert STL files to G-code for 3D printing
• batch-slice 3D models from the command line
• repair non-manifold 3D meshes before printing
• convert between STL, OBJ, AMF, and 3MF formats
• generate custom infill patterns and variable layer heights
• integrate slicing into a server-side or automated pipeline
• send G-code directly to printers or OctoPrint

When to choose

• you want a fully open-source, vendor-independent slicer for FDM/FFF or SLA/DLP printers
• you need fine-grained control over slicing parameters and custom G-code
• you want to script or automate slicing via CLI or embed libslic3r in your own C++ app
• you need broad printer/firmware compatibility (Marlin, Repetier, Smoothie, etc.)

When to avoid

• you prefer a modern, actively developed slicer with a polished UI (e.g., PrusaSlicer or Bambu Studio, which forked Slic3r)
• you need cutting-edge features or frequent versioned releases - development has slowed since 1.3.0
• you want a simple out-of-the-box experience with minimal configuration

Facets

application · maturity maintenance

cli gui graphics file-system developer-tools hardware cross-platform files windows cpp cli cross-platform 3d-printing slicer gcode stl cam reprap fdm sla toolpath-generation libslic3r automation linux macos desktop

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markdown · JSON · MCP: product_card(name="slic3r/Slic3r")