3d printed threads and snap connectors are nice, but M3 bolts and nuts are more robust and look dope. They also make the model easier todesign print, since you don’t have to worry about tolerances as much.
STEP/STL and instructions available here: www.printables.com/model/548770-master-spool
Fiberlogy actually sells them without a cardboard core and it is compatible with the master spool standard. But yeah. everyone always thinks their standard is better.