Bolt Head Fridge Magnet

Originally designed to cover small magnets in a template I created, these are broken out here as neat little refrigerator/whiteboard/toolbox magnets. They represent a M8 bolt head with a lock washer and washer. The cavity in the bottom is designed for a 12mm x 3mm round, neodymium magnet (available for less than $1 each at Amazon). I recommend pre-tapping the center hole for a flathead M3 x 5mm screw.

Because they require four filament changes to get the proper effect, it is a good idea to print these in multiples, probably with rafts.