Reuse a spool for refill filament

thingiverse

Reuse your old spool instead of wasting plastic on printing a new "masterspool". The outer diameter needs to be tight to your spool holder. The outer diameter firs 73mm Spools, scale it to fit your need. Cut your old spoolholder in half with ex a saw, and just push in this 3dprinted stl. Printed in 0.26mm layers , 0.8nozzle about 1-1.1mm Line width to avoid infill. Any filament would work.