Paper Cube Cut Out. If you need your cube to be sturdy, consider printing it on cardstock paper, or pasting your paper template onto cardboard before cutting it out. Do you know how to make a cube out of paper?
Free downloadable paper cube ninja from momtrusted.com.
I might be able to create a custom printable based on your request. Backup letter cubes on hard disk concept. The cube is one of the 5 platonic solids (convex regular polyhedra). One easy approach is to cut out a template and glue it into the shape of a cube.