Gears and transmission
Step-Powered Generator Assembly
- Bounding box
- 180.0 × 140.0 × 147.5 mm
- Engine
- Precision B-rep
- Parameters
- 28
- Published
- October 19, 2026
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The prompt
Build a simple functional 3D-printable step-powered generator from scratch. Create: - 180×140×8 mm base - 140×100×8 mm stepping plate above it - vertically moving rack plate connected to the stepping plate - straight rack, module 2 mm, 20° pressure angle, ~100 mm long - 20T input spur gear, module 2 mm, 20° pressure angle, 8 mm thick - interchangeable 20T, 30T and 40T output spur gears, same module/profile, 8 mm thick - two aligned 5–6 mm shafts - thick shaft-support blocks - simple generator mount - four corner attachment points for return springs/strings Mechanism: **stepping plate ↓ → rack ↓ → input gear rotates → output gear rotates → generator** Use external spur gears only. Calculate gear center distance correctly: **C = module × (Z1+Z2)/2**. Add ~0.3 mm gear backlash and sufficient shaft clearance. Output gears must be removable and interchangeable on the same shaft. Design specifically for FDM polyester, 0.4 mm nozzle, ~0.2 mm layers. Use strong teeth, ≥4 mm structural walls, simple geometry, minimal supports, no bearings, worm gears, planetary gears, or complicated mechanisms. Add mechanical travel stops. Ensure rack and gears mesh, shafts align, gears rotate freely, nothing collides, and every part is separately printable. Prioritize **simple, strong, functional, and easy to change gear ratios**.
Parameters
| Name | Value | Range |
|---|---|---|
| Base Length | 180 mm | 150 – 200 |
| Base Width | 140 mm | 120 – 160 |
| Base Thickness | 8 mm | 4 – 12 |
| Corner Anchor Hole Diameter | 5 mm | 3 – 8 |
| Stepping Plate Length | 140 mm | 120 – 160 |
| Stepping Plate Width | 100 mm | 80 – 120 |
| Stepping Plate Thickness | 8 mm | 4 – 12 |
| Rack Plate Length | 120 mm | 100 – 150 |
| Rack Plate Width | 25 mm | 15 – 35 |
| Rack Plate Thickness | 8 mm | 4 – 12 |
| Rack Teeth Count | 18 count | 14 – 22 |
| Gear Module | 2 mm | 1 – 3 |
| Pressure Angle | 20 deg | 14.5 – 25 |
| Input Gear Teeth | 20 count | 12 – 40 |
| Output Gear Teeth (20/30/40) | 30 count | 20 – 40 |
| Gear Face Width | 8 mm | 4 – 12 |
| Gear Backlash Allowance | 0.3 mm | 0.1 – 0.5 |
| Shaft Diameter | 6 mm | 5 – 8 |
| Shaft Clearance Diameter | 6.2 mm | 6 – 8 |
| Input Shaft Length | 70 mm | 50 – 90 |
| Output Shaft Length | 90 mm | 70 – 110 |
| Support Block X Thickness | 20 mm | 15 – 30 |
| Support Block Y Width | 35 mm | 25 – 45 |
| Support Block Height | 25 mm | 20 – 30 |
| Generator Mount Length | 40 mm | 30 – 50 |
| Generator Mount Width | 30 mm | 20 – 40 |
| Generator Mount Height | 10 mm | 6 – 15 |
| Generator Mount Clearance Diameter | 15 mm | 10 – 20 |
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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