Simple Box

Project Overview: 3D Open-Top Box

This script generates a rectangular container designed for 3D printing or CNC modeling. The design focuses on material efficiency and structural integrity for thin-walled objects.

1. Physical Dimensions

• External Dimensions: The box measures 150 mm (Width) by 120 mm (Depth) with a total Height of 60 mm.
• Wall Thickness: Set at 0.8 mm. This is a strategic choice for 3D printing; since most standard nozzles are $0.4$ mm, a $0.8$ mm wall represents exactly two perimeters (walls), making the print faster and structurally sound without unnecessary infill.

2. Geometry Logic (The difference() Function)

The code uses a "Constructive Solid Geometry" (CSG) approach:

• Outer Volume: A solid cube is created using the primary dimensions ($150 \times 120 \times 60$).
• Inner Cavity: A second, slightly smaller cube is subtracted from the first.
• Translation: The inner cube is shifted by $0.8$ mm (the wall variable) on the X, Y, and Z axes. This ensures the bottom of the box is also $0.8$ mm thick, while the top remains open.

3. Technical Details for Printing

• Volume Calculation: The internal storage space is exactly $148.4 \times 118.4 \times 59.2$ mm.
• Watertight Mesh: The script ensures a manifold geometry, meaning it is "watertight" and ready to be exported as an STL or OBJ file for slicing software.