A kind of puzzle that builds a sphere with 4 different piecesit's just for fun and because i like spheresI cut this with openoffice/draw ( http://download.openoffice.org ) on a zing laser cutter ( http://www.epiloglaser.com/zing_laser.htm )This is to cut in 3mm thick, for example MDFcut until you got 24 wheels with 5 slots 40 wheels with 6 slots 60 curved with 2 circles 30 curved with 3 circles ... and some sparesinsert 5 "2 circle curved" pieces between two "5 slot's wheels" once you get 2 of these, join them with the "6 slot wheels" and a "3 circle curved"continue, you'll get the sphereAnd many thanks to http://www.thingiverse.com/souriceaux06 for his conversion of the thing to ".dxf" formatthanks to http://www.thingiverse.com/amk for the plans of his derivative of 4mm with legsOk... english is not my main language... i do my best