Bambu Lab Refill Spool Version 4

Clean-room redesign of the BambuLab bulk refill filament spool that is more secure than the one that was designed by BambuLabs. This version is much easier to assemble and uses less filament than my previous versions. I recommend PETG or ABS if you're going to use this spool in a filament dryer or with the AMS2 or AMS HT.