Tricky 12 piece burr puzzle.

This is a 12 piece burr puzzle that probably isn't the easiest to solve. The solution requires several pieces to be moved before any piece is freed. All pieces are different.

I designed the puzzle using my own puzzle design program written in C++ and Qt together with OpenSCAD to generate the stl files. I plan to eventually publish the C++ and OpenSCAD program files but today the code is unfortunately in a state of constant change and undocumented confusion.

The files contains three stl f