Bottle top pin-badge adapter
thingiverse
Convert a bottle-top to a pin badge!Slide a small safety-pin through the print, then fit the print into the bottle-top and use pliers to squeeze the bottle-top around the print.This print is 26mm diameter (just over an inch) and the slot will fit pins where the coil is up to 2mm wide. You must fit the pin first!CAD is here, in case anyone finds a different size bottle or pin:https://cad.onshape.com/documents/9d3305175dcb49161a051263/w/92f821140e3f85b2c2d9e3b0/e/edf1ab7b46c8e38d61514797
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