Sample · module 1 · 20°

15T : 45T · NEMA 17 reducer

A 3 : 1 printed reduction for a NEMA 17 stepper: the pinion on its 5 mm D-flat shaft.

Printed drives15 : 45

Build it with your AI

Using the CheapCAD Tools connector, design a two-gear drive in Gear Designer: module 1 mm, face width 8 mm. Gear 1: 15 teeth, profile shift x = 0.25, a 5 mm bore, D-flat 0.5 mm deep, a hub on one face, Hub OD 12 mm, Hub Height 8 mm, 1 M3 set screw in a tapped hole. Gear 2: 45 teeth, profile shift x = -0.25, an 8 mm bore, spokes: 4 of them, Hub OD 16 mm, Width 4 mm, Rim Depth 5 mm, Fillets 0.5 mm at the rim and 1 mm at the hub, Spoke Height 4 mm (a thinned web). Check the design, apply any Auto-fix it suggests, then export both gears as STL and give me the download link.

Paste it into Claude, ChatGPT or any AI app with the CheapCAD Tools connector, and it designs this gear set with you, checks it and hands you the files. How to connect your AI.

What's in this design

Gear 1 · 15 teeth

15T gear · tip Ø17.5 mm · x = 0.25 · bore Ø5 mm D-flat · hub Ø12, 1 × M3 set screw (tapped)

Gear 2 · 45 teeth

45T gear · tip Ø46.5 mm · x = -0.25 · bore Ø8 mm · 4 spokes, rim 5, web 4

The mesh · module 1 · 20°

ratio 3 : 1 · centre distance 30 mm · contact ratio 1.56 · backlash 0.108–0.208 mm

The link opens both parts in the Gear Designer's 3D Mode. Change the teeth, module or pitch, bore, hub or spokes, then download STL, STEP, DXF or SVG.

More samples