Gears and transmission
Cassette Media Player Shell Assembly
- Bounding box
- 102.0 × 64.0 × 21.0 mm
- Engine
- Precision B-rep
- Parameters
- 26
- Published
- November 1, 2026
Download
Free to download and use. See the terms.
The prompt
Convert a standard cassette tape shell into an electronics enclosure for a portable media player. CASSETTE DIMENSIONS: 102mm × 64mm × ~9mm (needs +12mm thickness = ~21mm total, length/width unchanged) COMPONENTS TO HOUSE: 1. Screen (1.47" LCD): PCB 42×21×6mm, visible 34×19mm — centered between the two reels 2. SD Card Reader (blue PCB): 42×25×3mm — SD slot exits one edge 3. BT 5.0 module (XY-BT-MINI): 31×29×7mm — 3.5mm jack exits bottom edge 4. LiPo Battery: 41×20×6mm — sits on one side 5. Type-C USB 5V 2A Boost Converter: 25×20×6mm — sits on battery, USB-C exits bottom edge 6. ESP32: ~28×55mm PCB — inside, no external port needed 7. Two mouse encoders: 2mm 5-sided D-shaft — connected to reels via gears GEAR MECHANISM (1:1 ratio, one set per side): - Reel gear: 18mm pitch dia, 18 teeth, module 1.0, Ø14.5mm center hole — mounts around reel hub - Encoder gear: 18mm pitch dia, 18 teeth, module 1.0, 2mm D-shaft bore — mounts on encoder shaft - Mini-reel: small disc with 2mm D-shaft hole (like scroll wheel) - Center distance between gears: 18mm MODIFICATIONS: 1. Move reels apart to create 34mm gap for screen 2. Cut out: screen window, component pockets, SD slot, 3.5mm jack port, USB-C port 3. Add 12mm to back shell thickness 4. Keep original cassette shape and corner screw holes 5. Output as STEP files + STL files + assembly guide
Parameters
| Name | Value | Range |
|---|---|---|
| Cassette Length | 102 mm | 90 – 120 |
| Cassette Width | 64 mm | 55 – 80 |
| Front Shell Thickness | 4.5 mm | 3 – 8 |
| Rear Shell Thickness | 16.5 mm | 10 – 26 |
| Side Wall Thickness | 4 mm | 2 – 6 |
| Front Face Thickness | 1.5 mm | 1 – 3 |
| Rear Wall Thickness | 3 mm | 2 – 6 |
| Component Pocket Depth | 1.5 mm | 0.5 – 2.5 |
| Screen Window Width | 34 mm | 20 – 44 |
| Screen Window Height | 19 mm | 12 – 30 |
| Corner Screw Hole Dia | 2.2 mm | 1.6 – 3.2 |
| SD Slot Width | 14 mm | 8 – 22 |
| SD Slot Height | 3 mm | 1.5 – 5 |
| 3.5 mm Jack Port Dia | 6 mm | 4 – 9 |
| USB-C Port Width | 9 mm | 6 – 14 |
| USB-C Port Height | 3.6 mm | 2 – 6 |
| Gear Module | 1 mm | 0.5 – 2 |
| Gear Teeth | 18 teeth | 12 – 30 |
| Gear Thickness | 4 mm | 2 – 6 |
| Reel Gear Hub Bore | 14.5 mm | 10 – 16 |
| Encoder D-Shaft Bore | 2 mm | 1.5 – 4 |
| Gear Center Distance | 18 mm | 12 – 26 |
| Mini-Reel Diameter | 12 mm | 8 – 20 |
| Mini-Reel Thickness | 3 mm | 1.5 – 5 |
| Encoder Body Size | 12 mm | 8 – 16 |
| Encoder Shaft Dia | 2 mm | 1.5 – 4 |
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.
More models
Browse the full gallery →Spur Gearbox
design gearbox
Involute Spur Gear with Keyway
Precision Involute Spur Gear with Hub and Keyway: Module (m) of 2.0 mm, 40 teeth (z), Pitch Circle Diameter (d) of 80.00 mm, 20° pressure angle (\alpha), 15.00 mm face width (b), a
Parametric Helical Gear
Create a parametric helical gear with the following specifications: 32 teeth, normal module of 3 mm, right-hand helix, total face width of 80 mm, and a central bore hole with a dia
Rod with Spur Gear
Metal rod diameter is 20 mm and length is 100 mm and right side attach a gear and their OD is 50 mm
Spur Gear (12 Teeth)
Built a gear with 12 teeth
Two-Stage Spur Gear Reduction Assembly
Design a 2-stage spur gear reduction set for 3D printing with an overall 10:1 ratio. Stage 1: A 12-tooth pinion driving a 36-tooth gear (3:1). Stage 2: A 12-tooth pinion coupled