Self-Aligning, Adjustable-Width Spool Holder Using 608 Bearings

This is an adjustable width spool holder that uses easily printable parts plus four 608 skateboard bearings. My previous version of this had some small parts that needed to be printed out of ABS in order to not break yet still it risked being crushed or the printed screws breaking in half when put into heavy use.

This update is more robust and fully printable from PLA with only two parts (both tracks) needing support.

The pin (x4), if you print it seperate and scale it up a percentage point or or two, will have an interference fit and push into place for a permanent connection with the arms. When I printed this thing I did not bother to fine tune the pins by scaling but added a tiny amount of cyanoacrylate glue to the holes that the pins go into. If you go the glue route, so as to ensure no glue gets on parts that don't need glue, put the cyanoacrylate in the holes and not on the shaft of the pins.

The nut (x4) should be snug, if too tight, scale it up in the x/y directions