Gears and transmission
Planetary Gearbox Assembly (FDM, 20:1 ratio class)
- Bounding box
- 1878.8 × 112.0 × 90.0 mm
- Engine
- Precision B-rep
- Parameters
- 43
- Published
- November 11, 2026
Download
Free to download and use. See the terms.
The prompt
Create a fully parametric planetary gearbox assembly for FDM 3D printing. Specifications: - Housing outer diameter: 100 mm. - Total assembly length: 85 mm. - Sun gear: 20 teeth, module 1 mm. - Three planet gears: 20 teeth each, module 1 mm. - Internal ring gear: 60 teeth, module 1 mm. - Pressure angle: 20 degrees. - Input shaft diameter: 8 mm. - Output shaft diameter: 10 mm. - Include a planet carrier with 3 equally spaced planet shafts. - Include two bearing seats. - Include a removable housing cover secured with 6 screws. - Include suitable clearances for FDM printing. - All mechanical parts must be separate printable components. - Ensure correct gear meshing and concentric alignment. - No overlapping or intersecting solid geometry. Export each component separately as STL and provide the complete assembly as STEP.
Parameters
| Name | Value | Range |
|---|---|---|
| Gear Module | 1 mm | 0.5 – 2 |
| Sun Teeth | 20 teeth | 10 – 30 |
| Planet Teeth | 20 teeth | 10 – 30 |
| Ring Teeth | 60 teeth | 40 – 90 |
| Sun Face Width | 10 mm | 5 – 20 |
| Planet Face Width | 10 mm | 5 – 20 |
| Ring Face Width | 40 mm | 15 – 60 |
| Planet Bore (backlash) | 8.4 mm | 8 – 10 |
| Housing OD | 100 mm | 60 – 160 |
| Housing Length | 65 mm | 30 – 120 |
| Rear Wall Thickness | 8 mm | 3 – 20 |
| Ring Gear OD | 96 mm | 50 – 97 |
| FDM Fit Clearance | 0.25 mm | 0.05 – 0.6 |
| Mounting Flange OD | 112 mm | 90 – 170 |
| Mounting Flange Thickness | 6 mm | 2 – 15 |
| Mounting Hole BCD | 104 mm | 90 – 160 |
| Mounting Hole Dia | 4.2 mm | 2 – 8 |
| Input Shaft Dia | 8 mm | 4 – 20 |
| Input Shaft Length | 25 mm | 8 – 60 |
| Input Bearing Seat Dia | 15 mm | 9 – 30 |
| Input Bearing Seat Depth | 4 mm | 1 – 10 |
| Output Shaft Dia | 10 mm | 5 – 20 |
| Output Shaft Length | 20 mm | 8 – 50 |
| Output Bearing Seat Dia | 16 mm | 11 – 30 |
| Output Bearing Seat Depth | 3 mm | 1 – 8 |
| Carrier Plate Dia | 58 mm | 30 – 100 |
| Carrier Plate Thickness | 8 mm | 3 – 20 |
| Carrier Hub Dia | 20 mm | 10 – 40 |
| Carrier Hub Height | 4 mm | 1 – 12 |
| Planet Pin Dia | 8 mm | 4 – 14 |
| Planet Pin Length | 14 mm | 6 – 30 |
| Cover Thickness | 7 mm | 3 – 15 |
| Cover Bolt Circle Dia | 88 mm | 50 – 96 |
| Cover Screw Count | 6 pcs | 3 – 8 |
| Screw Boss Width | 7 mm | 4 – 16 |
| Screw Boss Height | 8 mm | 3 – 20 |
| Screw Pilot Hole Dia | 2.5 mm | 1.8 – 4 |
| Cover Clearance Hole Dia | 3.4 mm | 2.2 – 6 |
| Screw Shank Dia | 3 mm | 2 – 5 |
| Screw Length | 12 mm | 6 – 30 |
| Screw Head Dia | 5.5 mm | 3.5 – 10 |
| Screw Head Height | 2.2 mm | 1 – 6 |
| Exploded Layout Gap | 140 mm | 120 – 400 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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