I wanted to make a cube with inside walls (thickness), so I came up with this design (wireframed): I started with a 0.12 x 0.12 x 0.12 cube and extruded faces until I had a 1.2 x 1.2 x 1.2 cube like this. The problem is, there are tiny, tiny gaps visible where an extruded face meets another face: It's difficult to see but they're there. Very annoying! Anyone know why? Even if I build the cube in a different (better) way by making a frame like the first picture, then adding 0.8 x 0.8 x 0.12 walls, the gaps will be visible.