Easy Belt — Custom Timing Belt & Pulley CAD

Belt Parameters

Profile Tooth Count Belt Width (mm)

Advanced — tooth geometry (mm)

Tooth Height Tooth Width at Pitch Line Back Thickness Print Fit Offset (clearance for FDM tolerance)

File Name

STL is the printable 3D solid. DXF exports the flat 2D sketch (outer circle + tooth profile) on separate layers so you can pull it into Fusion 360 and re-extrude or edit the sketch yourself.

drag to rotate · scroll to zoom

Tooth profiles here are functional approximations tuned for FDM 3D printing (smooth curved flanks for GT2/HTD/AT-style profiles, straight flanks for MXL/XL/T-style profiles) — not certified industrial spec geometry. Use the Print Fit Offset and Advanced fields to dial in fit for your printer and mating pulley.

Pulley Parameters

Profile (matches belt profiles) Tooth Count Belt Width / Thickness (mm) Center Bore Diameter (mm) Flanges (keep the belt tracking on the pulley) Flange Outer Diameter (mm) Flange Thickness (mm, each)

Advanced — tooth geometry (mm)

Tooth Depth (groove depth) Tooth Width at Pitch Line Fit Clearance Offset (pulls tooth crest in slightly)

File Name

STL is the printable 3D solid, ready for your slicer.

drag to rotate · scroll to zoom

Pulley pitch diameter uses the same circumference = pitch × teeth relationship as the belt, so a belt and pulley built at the same profile and pitch diameter will mesh correctly. The tooth crest is pulled in slightly by the Fit Clearance Offset to avoid interference with the mating belt's tooth tips — increase it if the belt binds, decrease it if it's loose.

Center Distance → Belt Size

Belt Profile Center-to-Center Distance (mm) Pulley 1 — Teeth Pulley 2 — Teeth

Uses the standard open-belt length formula from pitch diameters. Gives you the exact tooth count required, plus the closest whole-tooth belt sizes shorter and longer than that, each with the center distance you'd need to actually fit them.

Result

Enter your setup and hit Calculate.