It's a foldable box based on the Net of Cube design, basically I added a lid border to close by friction.

All prints I teste were printed with 0,3 mm layer height, thought it would be faster but in this case not so much.

Version 1 : cube has 2 mm wall thickness and folds are  0,4mm thickness ( if printed 0,2mm layer height, with  0,3mm the cube wall will be 2,15mm thickness). 

Full size the folds are stiffer, 0.4 mm thickness, so need to fold a bit more to close.

I printed 50% size to test fast, looks more like a fidget toy and it's easier to fold because the fold  thickness is 0.2mm.

Version 2: cube has 1 mm wall and  0,2mm fold thickness

  V2 is faster to print but is get floppy. But it worked to store my watch.