Enclosures and housings
Threaded Two-Part Cylindrical Enclosure
- Bounding box
- 29.0 × 29.0 × 14.0 mm
- Engine
- Precision B-rep
- Parameters
- 22
- Published
- November 9, 2026
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The prompt
Design a two-part cylindrical mechanical enclosure consisting of a bottom base and a top cap. Dimensions: The overall outer diameter is 29mm. The internal hollow diameter is 26.5mm, leaving a 1.25mm wall thickness and enough internal clearance to house a 25mm circular PCB. The total assembled height is 14mm. Mating Mechanism: Split the enclosure horizontally across the middle. Join the two halves using a continuous threaded screw mechanism. Generate external (male) helical threads on the upper inner lip of the bottom base, and matching internal (female) helical threads on the lower inner lip of the top cap. Features: On the side wall of the bottom base, cut an 11mm wide by 5mm high rectangular opening. This is for a USB-C port and is intentionally oversized for cable housing clearance. On the top flat face of the top cap, cut two separate 2.5mm circular holes positioned slightly off-center to allow light from internal LEDs to pass through. Add a 1.6mm thick internal annular ledge inside the bottom base to act as a resting shelf for the PCB. Output the final design as a solid .STEP file.
Parameters
| Name | Value | Range |
|---|---|---|
| Outer diameter | 29 mm | 20 – 50 |
| Internal hollow diameter | 26.5 mm | 15 – 45 |
| Bottom base body height | 7 mm | 3 – 15 |
| Top cap height | 7 mm | 3 – 15 |
| Bottom floor thickness | 1.25 mm | 0.5 – 4 |
| Threaded neck height | 3 mm | 1 – 8 |
| Neck core outer diameter | 26 mm | 15 – 28 |
| Neck inner diameter | 25.4 mm | 12 – 26.5 |
| Neck shoulder thickness | 0.5 mm | 0.2 – 1.5 |
| Thread pitch | 1 mm | 0.4 – 2.5 |
| Thread engagement length | 2.4 mm | 1 – 4 |
| Round thread profile radius | 0.3 mm | 0.15 – 0.45 |
| Male thread major diameter | 27 mm | 26.5 – 27.1 |
| Thread start above joint | 0.3 mm | 0.1 – 1.5 |
| PCB ledge thickness | 1.6 mm | 0.5 – 4 |
| PCB ledge inner diameter | 22 mm | 8 – 26 |
| USB-C opening width | 11 mm | 5 – 25 |
| USB-C opening height | 5 mm | 2 – 10 |
| USB-C opening centre height | 4 mm | 1.5 – 8 |
| Top plate thickness | 1.25 mm | 0.5 – 4 |
| LED light hole diameter | 2.5 mm | 0.5 – 8 |
| LED hole centre offset | 4 mm | 0 – 12 |
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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