Brackets and mounts
Water Rocket Fin Can (500 ml PET)
- Bounding box
- 161 × 161 × 80.0 mm
- Engine
- 3D Printing B-rep
- Parameters
- 17
- Published
- October 29, 2026
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The prompt
A parametric 3D printable water rocket fin module designed to slide-fit onto a 500ml Coca-Cola PET bottle with a 67.1mm outer diameter. The core consists of a cylindrical mounting sleeve with a 67.4mm inner diameter, 1.8mm wall thickness, and 80mm height, featuring subtle internal friction ribs for a glue-free press fit. Four symmetrical swept-back trapezoidal fins are radially arrayed around the sleeve at 90-degree intervals. Each fin has a root chord of 75mm, tip chord of 30mm, low-drag span height of 45mm, leading-edge sweep angle of 35 degrees, and a 2.0mm thickness tapering to 1.2mm at the tip. Fins include a 0.5-degree cant angle for slow rotational spin stabilization. Manifold solid, zero overhangs, optimized for support-free FDM 3D printing.
Parameters
| Name | Value | Range |
|---|---|---|
| Bottle outer diameter | 67.1 mm | 50 – 90 |
| Diametral slip clearance | 0.3 mm | 0.1 – 0.8 |
| Sleeve wall thickness | 1.8 mm | 1.2 – 5 |
| Sleeve height | 80 mm | 30 – 200 |
| Bore lead-in chamfer | 1 mm | 0.4 – 3 |
| Number of ribs | 8 mm | 3 – 16 |
| Rib grip into bore | 0.3 mm | 0.1 – 0.8 |
| Rib width | 2.4 mm | 1 – 8 |
| Rib end margin | 6 mm | 1 – 25 |
| Number of fins | 4 mm | 3 – 8 |
| Root chord | 75 mm | 20 – 200 |
| Tip chord | 30 mm | 10 – 100 |
| Span | 45 mm | 15 – 120 |
| Leading-edge sweep | 35 deg | 0 – 70 |
| Root thickness | 2 mm | 1.2 – 6 |
| Tip thickness | 1.2 mm | 0.8 – 4 |
| Cant angle | 0.5 deg | 0 – 5 |
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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