Enclosures and housings
Lego 1x4 Technic Brick
- Bounding box
- 31.8 × 7.8 × 11.3 mm
- Engine
- Precision B-rep
- Parameters
- 15
- Published
- November 2, 2026
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The prompt
Create a precise 3D CAD model of a single 1x4 Lego Technic-compatible brick designed for STEM robotics. The main rectangular body must have exact dimensions: 31.8 mm in length, 7.8 mm in width, and 9.6 mm in height. On the top surface, generate 4 cylindrical studs, evenly spaced with an exact pitch of 8.0 mm between their centers. Each stud must have a diameter of 4.8 mm and a height of 1.7 mm. Along the center of the longest side face, create 3 horizontal through-holes designed for standard pins and axles. Each hole must have a diameter of 4.8 mm, perfectly centered vertically (4.8 mm from the bottom edge), and spaced exactly 8.0 mm apart from each other. The bottom face must be hollowed out (shell feature) with a uniform wall thickness of 1.2 mm. Inside this hollow cavity, include 3 internal cylindrical tubes with an outer diameter of 6.5 mm and an inner diameter of 4.8 mm to interlock with standard studs. Apply a 0.2 mm fillet to all sharp outer edges for realistic plastic injection molding simulation. The final output must be a single, solid, manifold B-rep step file suitable for high-precision 3D printing.
Parameters
| Name | Value | Range |
|---|---|---|
| Length | 31.8 mm | 10 – 100 |
| Width | 7.8 mm | 5 – 20 |
| Height | 9.6 mm | 5 – 20 |
| Wall Thickness | 1.2 mm | 0.4 – 3 |
| Stud Diameter | 4.8 mm | 3 – 8 |
| Stud Height | 1.7 mm | 0.5 – 5 |
| Stud Pitch | 8 mm | 5 – 15 |
| Number of Studs | 4 | 1 – 6 |
| Hole Diameter | 4.8 mm | 3 – 8 |
| Number of Holes | 3 | 1 – 6 |
| Hole Spacing | 8 mm | 5 – 15 |
| Hole Vertical Center | 4.8 mm | 2 – 8 |
| Tube Outer Diameter | 6.5 mm | 4 – 10 |
| Tube Inner Diameter | 4.8 mm | 2 – 8 |
| Fillet Radius | 0.2 mm | 0 – 1 |
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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