Parametric generator

Planetary Gearbox Generator

Design the sun gear, planet gears, ring gear and carrier with sliders — export directly as 3MF. Tooth counts and planet count are checked automatically for mechanical validity (assembly condition, collision-free).

3MFprint-ready export

Live3D preview in your browser

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Ratio & teeth

Sun gear teeth 12

Planet gear teeth 18

Number of planet gears 3

Ring gear: 48 teeth · ratio 1:5 (carrier output, ring gear fixed)

Tooth shape & dimensions

Module 1.5 mm

Pressure angle 20 °

Face width (gears) 10 mm

Shafts & fit

Sun shaft bore 6 mm

Carrier output shaft bore 8 mm

Planet pin Ø 4 mm

Fit clearance (all bores) 0.4 mm

Extension

Extend output shaft

A shaft stub protrudes beyond the back cover — for docking another stage (e.g. a second planetary gearbox whose sun gear bore fits onto it)

Housing

Cover thickness 4 mm

Screw Ø (4×) 3 mm

7 parts are generated (shown in different colors, pulled apart in the preview for clarity): Front cover, Sun gear, 3–6× planet gear, Ring gear, Carrier (with planet pins), Back cover. Sun gear = input, ring gear = screwed fixed into the housing, carrier = output. All gears share the same module and pressure angle (otherwise they will not mesh properly). Tooth counts and planet count are adjusted automatically so that the assembly condition and collision-free spacing between the planets are met — the values actually used are shown in the ratio info above.

All 7 parts as separate, individually placeable objects in one 3MF file — each planet gear and the carrier (fused with all pins) can be arranged on its own.

All shapes are built purely additively from basic solids (no Boolean CAD kernel) — this is unproblematic for 3D printing; every common slicer turns the exported 3MF file into a clean, printable model. The involute gearing uses the same verified calculation as in the 3D Object Generator (gear base shape).