# slic3r/Slic3r

Open Source toolpath generator for 3D printers

Repository: https://github.com/slic3r/Slic3r
Canonical: https://ross.abutalabs.com/products/slic3r
Homepage: https://slic3r.org/
Language: C++
License: AGPL-3.0
License Family: copyleft
Topics: 3d-printing, cam, digital-fabrication, 3d-printer, stl
Last push: 2024-06-18T02:49:57+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 5480, "days_push": 806, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3650, forks 1317 (observed 2026-08-28T04:08:13.029206+00:00)

## What it is
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
- artifact type: application
- maturity: maintenance
- function: cli, gui, graphics, file-system, developer-tools
- domain: hardware, cross-platform, files
- platform: windows, cpp, cli, cross-platform
- tags: 3d-printing, slicer, gcode, stl, cam, reprap, fdm, sla, toolpath-generation, libslic3r, automation, linux, macos, desktop

## Member repositories
- slic3r/Slic3r (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:13.029206+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:31:41.992488+00:00, confidence not recorded.
  - readme: https://github.com/slic3r/Slic3r (fetched 2026-08-28T04:08:13.029206+00:00, sha 19a9f175909a)
  - homepage: https://slic3r.org/ (fetched 2026-08-29T09:26:01.528217+00:00, sha db0f77f96033)
  - site_page: https://slic3r.org/about (fetched 2026-08-29T09:26:01.531195+00:00, sha b754d0109576)
  - site_page: https://slic3r.org/releases/1.3.0 (fetched 2026-08-29T09:26:01.536245+00:00, sha f518bbcf6ede)
  - site_page: https://slic3r.org/donations (fetched 2026-08-29T09:26:01.539340+00:00, sha 4fec7cf09222)
- Data as of 2026-08-30T08:39:29.467469+00:00.