generating supports…
Auto Fins v3.0.0-rc.3  GitHub ☕ Ko-fi
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Print it support-free, in any slicer

Rotate a part however it prints best, and Support Fins bakes the breakaway supports right into the STL. It prints the same on any machine, in any slicer, with supports turned off.

  1. Import an STL, 3MF or OBJ. Drop it anywhere on this page.
  2. Rotate it. Red marks every surface that needs support.
  3. Export. Fins come baked in — no slicer supports needed.

Nothing is uploaded. The file is read inside this tab and never leaves your machine.

What's new v1.0.5

  • The Rotate buttons turn 45° a click instead of 90°, so leaning a part back is one click and 90° is two.

v1.0.4 2026-11-05

  • Full coverage no longer builds a wall through the part where its underside steps: the wall becomes two, one each side of the step, so it still breaks away cleanly. Draw mode asks for two lines there.
  • Auto builds about a quarter faster on some tilted parts, with the same supports.

v1.0.3 2026-11-05

  • Full coverage builds live: walls appear as they're placed, a progress bar shows how far along it is, and Stop keeps what's shown.
  • Full coverage builds up to twice as fast on big or busy parts, with the same supports.

v1.0.2 2026-11-03

  • Anchor fins can be short, down to 5 mm: click low on a side for a doorstop that keeps a tall part on a small base from tipping, with Brace depth up to 200%. From BorisKozo's Stabilizer (#426).
  • Anchor fins: a tool of its own for holding a leaning part from its up-facing back, curved or flat, without turning on Auto's sway braces. Sway braces go back to upright sides; a leaning back now takes an anchor.
  • A brace placed by hand now follows a side that curves up its height, convex or concave, instead of only standing on flat spots.
  • CLI preserved projects can bake negative parts for print-by-object, retaining exterior painting and part settings, with complete resume checkpoints and warnings to verify sliced materials and clearance.
  • Try longitudinal walls for isolated narrow struts left unsupported by the normal placement.

v1.0.1 2026-10-30

  • Support gently bent small tubes using their actual curved underside.

v1.0.0 2026-10-29

  • Full coverage mode: every red overhang gets support, with a second pass for figures
  • Curved, downhill and arc walls that follow an overhang to the plate
  • Cleaner snap-off: tines touch the part's surface instead of biting in, and the 3MF exports supports as their own object
  • Plugins for Orca, Cura, Fusion, FreeCAD, Blender, SolidWorks, Rhino and PrusaSlicer, on the same engine as the site
  • Calibrate menu: test prints that tune the fins to your printer
  • Several models on one plate, with Move and Arrange
  • Any nozzle from 0.2 to 2.0 mm, layers up to 0.6 mm, and thicker walls
  • Resin: pins that snap at the surface and feet a scraper can get under
  • Interface material for toolchanger printers
  • Works on phones, and in German, Dutch, Portuguese, Chinese and Arabic
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Free and open source. If it ever saves you a print, buy me a coffee ☕.

or drop it anywhere on the page