Cube Puzzle

A simple cube puzzle based on a child's posting box. Eight small cubes are to be assembled into a larger cube. The small cubes are connected by square, cylindrical, or triangular holes and extrusions. The problem is presented in two forms, one where the large cube has smooth sides, a second where the large cube is decorated with additional holes. Both have the same solutions; the second version may be more difficult. OpenSCAD code is included.