Bill Cutlers Classic Six-Piece Burr

This is supposed to be the most advanced 6 piece puzzle, original designed by Bill Cutler:
http://billcutlerpuzzles.com/stock/baffling.html

You need to do 5 moves to remove the first piece.

Designed with FreeCAD 0.17 (unreleased), you can also find the original FreeCAD file for further modifications. Cube size and tolerance can be set in the spreadsheet.