geeetech dremal spool incert
thingiverse
Made this because the center of the spool of the Geeetech filament I got was so large it didn't spin very freely, Its also can be used to mount the filament on a dremal 3d printer. Its a 75 MM outer diameter I had another Geeetech that was smaller so measure your spool first. Use 2 of them on the spool to keep it level or one if you dont mind it tipping some.
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