GrblGrus's Cube Puzzle (STL version for 3D printing)

I wanted to make this neat little cube puzzle, but the original Thing only had files for a laser cutter or CNC mill (neither of which I have). Fortunately, ZenziWerken included a PDF of the piece shapes in the Thing files and all the pieces are simple shapes, so it only took me a few minutes in OnShape to model the pieces and export meshes of them.

I've already printed this once, but I wrote on the pieces to help me solve the puzzle and forgot to take pictures first; I'll do another print soo