preFlight Slicer review
A profile-friendly FDM slicer with detailed overrides, painted supports, color tools and G-code scripting.
Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
preFlight Slicer is desktop software that turns 3D models into G-code for modern printers running RepRap-flavored G-code. Its FDM focus and profile-import options make it a fit for solo users and small teams who want to customize slicing settings or build on profiles from PrusaSlicer, SuperSlicer or OrcaSlicer. It supports STL, OBJ, 3MF, AMF and STEP files, and offers builds for Windows, macOS, Linux and Raspberry Pi. The GNU AGPL v3 license makes it an open-source option for users who value that licensing model.
Its most distinctive workflow is the combination of granular settings and visual edits. Users can override settings at the object, part or modifier level, then reslice changes in place from the Preview sidebar. Support types can be painted onto different areas of an object, while multi-filament color mixing includes painted color selection. Python scripting in the G-code generation pipeline adds another route for users who want to customize preprocessing. These capabilities suit profile-focused workflows; the scripting element is less compelling for someone seeking only a basic path from model to print file.
Output can be exported to disk, sent over FTPS or directed to a networked printer. This gives preFlight several G-code delivery routes, while keeping the product centered on slicing rather than a broader printer-management workflow. The vendor describes compatibility with RepRap-flavored G-code printers, so users should assess that fit against their printer setup. With free, open-source availability and support through email and community channels, preFlight is worth considering for FDM users who want control over profiles, supports, colors and preprocessing. Users looking for a resin-oriented slicer or a simpler workflow without detailed customization should choose an alternative aligned with those needs.
preFlight Slicer pros and cons
- Where it wins
- Imports profiles from PrusaSlicer, SuperSlicer and OrcaSlicer
- Offers object, part and modifier overrides with in-place reslicing
- Combines painted supports, multicolor selection and Python G-code preprocessing
- Where it doesn't
- Compatibility is described for RepRap-flavored G-code printers
- The product is focused on FDM printing
- Python preprocessing may not suit users seeking a non-scripted G-code workflow
preFlight Slicer fact sheet, pricing and score →
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update