This cube reveals a different letter as you view each side, the initials “DJR”

This one turned out to be tricky. I had to create an inverse copy for the inside. The connecting tabs all had to be trimmed and inserted between the two layers, it was like a brain teaser to assemble in 3 dimensions. If I had printed it double-sided, i would not be able to hide the tabs.

Forget to photograph this one.