Wire spool

This was made as a mean to save the filament when a cardboard falls appart. That being said I would not advise this design as a plan A for AMS since the transfer process is less than ideal. It would work a lot better with spooless filament coils that are properly secure.

The bolt needed are ¼-20 UNC x 2 ¼ in length with nuts and flat washers.

The inner diameter is 1-5/8 in (41 mm) so it might not fit all printers that hang spools by the center.