Design inputs

Reduction ratio input : output

Shaft Ø steel rod, mm

Tooth profile

Shaft exits click a face

Compact casing — hug the gearsSaves space & material: the case follows the gear circles instead of a rectangle. Gears stay full size.

Lid fitting base ↔ lid

Box size outer, mm

L

B

H

Auto-size boxTracks gear diameter, face stack, wall thickness, screws and side takeoff clearance.

Advanced

Max stages

Pinion teeth

Screw size when screwed

Printed bearing bossesAdds sleeve/boss support wherever shafts pass through the case.

Helix angle helical / herringbone

Wall thickness mm

Shaft protrusion mm

Pressure angle deg

Backlash mm

Module is auto-chosen (≥ 1 mm) so the smallest gear keeps a strong rim over the shaft — shaft Ø is capped to suit. Gears press-fit to steel shafts (bore = shaft Ø +0.1); casing bores clear the shaft (+0.35). Verify all fits on a test print.

Single gear

Type

Teeth

Module mm

Thickness face, mm

Bore Ø 0 = solid

Advanced

Pressure angle deg

Bore clearance mm

Backlash mm

A standalone spur gear. Pitch Ø = module × teeth; outside Ø = module × (teeth+2). Bore is a clearance fit on a rod (Ø + clearance); set 0 for a solid blank.

Result

Export · parts

ZIP = every printed part + the assembly + a PDF guide (which part & how many). Shafts are NOT included — supply Ø-matched steel rod. Print base & lid flat, gears flat on their face. PETG/Nylon for load-bearing, PLA for demos.