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Five Dollar Filament Threaded Spool
This spool is sized for Protoparadigm's convenient $5 filament sample packs. It uses plastic-friendly threads + a locking detent to disassemble and reassemble simply & reliably. The spool ID is 50mm, and an adapter is included to go down to 25mm.
The source files (Solidworks) are included & formatted for easy editing.