preFlight Slicer

At a glance

• Editor score
  6.3 / 10
• Pricing
  Free plan
• Best for
  FDM users who customize profiles and G-code workflows
• Free plan
  Yes
• Paid from
  Free
• Printer types
  Fdm
• Facts checked
  14 Nov 2026

• 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

Our verdict on preFlight Slicer

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.

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preFlight Slicer pricing

preFlight Slicer fact sheet

Alternatives to preFlight Slicer

• Bambu StudioA free desktop slicer with detailed FDM controls and remote printer tools.9.2
• Creality PrintA free desktop slicer with G-code generation, multicolor tools, and compatible-printer control.9.1
• IceSLProcedural modeling and specialized slicing tools, with a license limited to research and academic use.9.0

See all preFlight Slicer alternatives →

Featured on iTechGuides

preFlight Slicer is listed in our 3D Printing Slicers directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026

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Last updated 14 Nov 2026 · How we research and update