Fin Studio is a free browser tool for designing surfboard fins and printing them at home. Draw the outline, tune the foil and the flex, and export a print-ready STL, 3MF or OBJ with the exact base geometry for the box already glassed into your board — no CAD experience needed, nothing to install.
What you can do
- Shape the template by dragging the tip, the tail and the edge handles
- Pick FCS, Futures or a US longboard box — the standard tab is drawn at production geometry
- Tune foil sections (flat, 80/20, 50/50, hand-drawn), thickness and tail lift
- Check printability: every problem is flagged before you waste filament, most with a one-click fix
- Export single blades or a whole thruster or twin set, plus a fit-test coupon
How do I make a 3D printed surf fin?
Design it in the browser, export the STL, and print it flat in PETG or a carbon-fibre blend. The recipe panel gives walls, infill and orientation matched to the flex you asked for, so the printed blade bends like a production one.
Does it fit real FCS and Futures boxes?
Yes — the tab matches the standard boxes: a 113.5 × 12.7 mm, 7 mm thick Futures single tab with screw seat and hook notch, and 20 × 13.5 × 6 mm FCS dual tabs on 53 mm centres, with print clearance built in. A small test coupon lets you calibrate your printer against the actual slot before committing to a full set.