Mounts an 80mm fan to the Solidoodle in a simple way to cool the board. I spliced my 80mm fan to an old 12 volt adapter from a router for power. Magnets are 8mm dia x 3mm rare earth magnets purchased at Frys. 10 of em were like $6. *Don't think the STL is flipped the right way to print. Magnets were a press fit for me. Depends on how your printer prints. You could glue them in or wrap tape around it once if it's loose. Fan was screwed in with screws supplied by fan manufacturer.