Summary

This is a mandrel to hold filament spools with holes from 30mm through 60mm. You'll need a 1/4" nut and bolt (about 4" long). I designed it so the end mandrel can be removed without fully unscrewing the nut so it can still be used if you damage the threads when you chuck it into your drill. In fact, you may want to sand/file the tops off the threads on the end once assembled so they don't mar the drill chuck. Make sure to slide the bolt head fully in place before drawing it down into its seat.

No supports required to print.