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.
- Import an STL, 3MF or OBJ. Drop it anywhere on this page.
- Rotate it. Red marks every surface that needs support.
- 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
See all releases
Free and open source. If it ever saves you a print, buy me a coffee ☕.