It fits the Raspberry Pi Pico perfectly with no screws, the RPi and the lid slide from the back (see pictures). It's ideal when you don't need any IO, just a USB connection.

I made it as tiny as possible (1mm features, 0.2mm tolerance, 0.5mm chamfer).

This model was made as part of another project that I have on GitHub. The source file (FreeCAD) is also available on GitHub (includes a different project box).

Printing

• I only ever printed it in PLA. 0.2mm or 0.12mm layers (0.12mm best). No supports.

• Print the lid flat side down.

• Only 5g of material.

Important Notes

• Clean the print well, ensuring that any extra material is removed (especially near the rails and latch).

• When inserting the USB cable, avoid stress on the lid by holding your thumb near the latch.

• To remove the lid pull down slightly near the latch while sliding the lid.