Best Open-Source 3D Printing Software 2026: 8 Options Compared

Open source runs deep in 3D printing: the slicers most people use are descended from one another. Slic3r came first, PrusaSlicer forked from it, and Bambu Studio, SuperSlicer and OrcaSlicer all trace back to PrusaSlicer, with Cura on a separate line. All are free to use and share the AGPL-3.0, except Cura, which is LGPL-3.0. The practical consequence is that settings feel familiar across them, so switching slicers is less painful than it sounds. Pick by printer support and by how much tuning you want. Cura is the broadest default; PrusaSlicer has clean beginner, advanced and expert modes; OrcaSlicer adds calibration tools for people who like to tune; SuperSlicer exposes even more settings; Bambu Studio is built around Bambu Lab hardware. For the model itself, FreeCAD and OpenSCAD give you dimension-driven parts and Blender covers organic work. The trade-off with open source here is polish: some slicers update quickly and break profiles, so keep a known-good version when a long print matters. Forks also drift. Bambu Studio and OrcaSlicer share a base, but profiles are not always interchangeable between them. Check which one your printer vendor actually supports before you commit to it, since the vendor's tested profiles save more time than any feature.

UltiMaker Cura

LGPL-3.0 slicer from UltiMaker, the broad default with a free download. We confirmed the license from the repository because the vendor site blocked our fetch.

Price: Free (Free and open source under LGPL-3.0) (UltiMaker Cura pricing, checked 2026-10-24).

Platforms and license: Desktop. LGPL-3.0 (open source) (license source).

Project activity: 7.1k GitHub stars · latest release 5.13.0 (May 28, 2026) · last commit Oct 27, 2026

Best for: Mixed printer brands.

PrusaSlicer

AGPL-3.0 slicer that is free with no account required. Three modes let a beginner start simple and grow into expert settings.

Price: Free (Free, open source, no account required, per the PrusaSlicer page) (PrusaSlicer pricing, checked 2026-10-24).

Platforms and license: Windows, macOS, Linux. AGPL-3.0 (open source) (license source).

Project activity: 9.4k GitHub stars · latest release version_2.9.6 (Jun 25, 2026) · last commit Sep 21, 2026

Best for: Clean interface that scales with you.

OrcaSlicer

AGPL-3.0 open-source slicer with built-in calibration and per-feature control. More settings than a first-time user needs.

Price: Free (Free, open-source slicer for FDM printers, per orcaslicer.com) (OrcaSlicer pricing, checked 2026-10-24).

Platforms and license: Desktop. AGPL-3.0 (open source) (license source).

Project activity: 16.2k GitHub stars · latest release v2.4.2 (Jul 7, 2026) · last commit Oct 28, 2026

Best for: Calibration and tuning.

Bambu Studio

AGPL-3.0 slicer from Bambu Lab, built on PrusaSlicer, with Windows, macOS and Linux releases. Strongest on Bambu printers, less tested elsewhere.

Price: Free (Free; licensed AGPL-3.0 per the project README) (Bambu Studio pricing, checked 2026-10-24).

Platforms and license: Windows, macOS, Linux. AGPL-3.0 (open source) (license source).

Project activity: 5.2k GitHub stars · latest release v02.08.02.61 (Aug 21, 2026) · last commit Oct 13, 2026

Best for: Bambu Lab machines.

SuperSlicer

AGPL-3.0 PrusaSlicer fork with extra settings. The README lists releases for Windows, Linux and macOS; expect a denser interface than the parent.

Price: Free (Free and open source; README states AGPL-3.0) (SuperSlicer pricing, checked 2026-10-24).

Platforms and license: Windows, macOS, Linux. AGPL-3.0 (open source) (license source).

Project activity: 4.3k GitHub stars · latest release 2.5.59.13 (Jul 1, 2024) · last commit Oct 11, 2026

Best for: Advanced users who want every setting.

Worth knowing: README calls it a PrusaSlicer fork and lists Windows, Linux and macOS 64-bit releases.

FreeCAD

LGPL-2.1 parametric modeler for printable mechanical parts. Built from sketches and constraints; 2D drafting is not its strength.

Price: Free (Free, no sign-up) (FreeCAD pricing, checked 2026-10-22).

Platforms and license: Windows, macOS, Linux. LGPL-2.1 (open source) (license source).

Project activity: 34.9k GitHub stars · latest release 1.1.4 (Sep 28, 2026) · last commit Oct 27, 2026

Best for: Functional printed parts.

Worth knowing: Mainly parametric 3D; 2D drafting is not its strength.

OpenSCAD

GPL-2.0 modeler where parts are scripts. Great for adjustable designs and version control, with no point-and-click sketching.

Price: Free (Free software; no paid tier) (OpenSCAD pricing, checked 2026-10-23).

Platforms and license: Windows, macOS, Linux. GPL-2.0 (open source) (license source).

Project activity: 10.5k GitHub stars · latest release openscad-2021.01 (Feb 7, 2021) · last commit Oct 27, 2026

Best for: Parametric printed parts.

Worth knowing: Script-based solid modeler: you describe parts in code, there is no drag-to-sketch interface. License from an archived copy of openscad.org; other listings say GPL-2.0-or-later.

Blender

GPL-3.0 3D suite for organic shapes and mesh repair. Heavy for simple geometry, so use it only when the part is not mechanical.

Price: Free (Free for any purpose, including commercial work) (Blender pricing, checked 2026-10-22).

Platforms and license: Windows, macOS, Linux. GPL-3.0-or-later (open source) (license source).

Best for: Figurines and mesh cleanup.

Worth knowing: Texture painting and baking are built in, with node-based shading; no layer stack with smart materials like Painter.

Compare: Blender alternatives

Which one to pick

• You want one slicer that works with many printers: UltiMaker Cura
• You use a Bambu Lab printer: Bambu Studio
• You enjoy calibrating flow and pressure advance: OrcaSlicer
• You design adjustable parts as code: OpenSCAD