3D Printing / CAD Utility

Parametric Gear Generator

Design an involute spur gear, watch it update live in 3D, and export a print-ready STL

Tooth Profile

Backlash and a root fillet both help printed gears run smoother and resist tooth breakage.

Gear Body

For square/hex, bore ⌀ is measured corner-to-corner (circumscribed).


Presets

Export

48.00 mm
Pitch ⌀
52.00 mm
Outer ⌀
43.00 mm
Root ⌀
6.28 mm
Circular Pitch

Gear Terminology

α — Pressure angle Pitch ⌀ Base ⌀ Root ⌀ Outer ⌀ m = d / N Module = Pitch ⌀ / Teeth
Module (m)
Tooth size in mm. Module (m) = Pitch Diameter (d) / Number of Teeth (N). Two gears must share the same module to mesh.
Pitch circle
The imaginary rolling circle the tooth size is defined against — not a physical edge on the gear.
Pressure angle (α)
The angle of the tooth flank at the pitch circle. 20° is standard; it sets how "pointed" vs "stubby" the teeth are.
Center distance
Two meshing gears' shaft centers should be spaced (Pitch ⌀₁ + Pitch ⌀₂) / 2 apart. Little to no additional slop should be needed for appropriate depthing. Your gear's Pitch ⌀ is shown above the viewport.