Reusable spool adapter
thingiverse
Adapter for certain 3D printer spools to make them accept refills, spool needs to be cut 10-12mm from the edge of the spool to accept the outer adapter. The two pieces glue into the two cut halves and then use standard #6 wood screws, 1/2-3/4" should do. Update : Added pictures with a clear spool before modification to show how it mounts, also pictures with it screwed together.
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