This is a complete case for the Wantmoore.tech LEDeez v2.0 pixel controller.  The lid is a friction fit design.

It's relatively thin - so should print with “all walls/top shell/bottom shell" and be plenty strong.

• .2mm layer height
• 4 wall loops
• 4 bottom + 4 top shell layers
• Infill = irrelevant

You'll need 4x M2x6 screws to fasten the LED controller to the case.

Ready-to-print 3MF for BambuStudio, Orca, etc are available on MakerWorld.

Files generated using the 3D Shell functionality within EasyEDA which works awesome for making simple boxes. STEP files also available in the file section.