Nothing too complicated - just a box for loose stack of note papers. But it was useful practice task on modelling a hexonal grill in Inventor.

Designed with inner space sized 90x90mm, can be easily scaled up or down for different papers. Prints without supports from PETG.

If there's not enough hexagons for your taste, you can use the “_A” version with exposed infill on the bottom - a simple, yet very nice trick described here at Prusa3D Blog