Textured fidget cube

This is a slight modification to the [Customizable easy print fidget cube](http://www.thingiverse.com/thing:2119728) by Aahz, to add textured surfaces to the cube faces. One of the faces is the [Companion Cube](http://www.thingiverse.com/thing:915) by gianteye.

The bottom face has a tread pattern that tends to get wiped out when the first layer gets squashed during printing. The only way I have been able to recover this is by printing with a raft, which is a hassle to remove and makes the b