I needed a simple box, and it was frustrating to wade through all the random designs on Thingiverse. All I needed was a 100mm long box to contain my water flavor enhancers that would fall over and through my wire kitchen rack! So I just whipped this up in TinkerCAD in 5 minutes. Maybe it helps you.

Dimensions are 100mm (d) x 63mm (w) x 60mm (h).

Volume is approximately ~350ml or so accounting for walls.

It's a box with vertical walls, so no need for supports.