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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
Variation in refill winding diameter really put me off the master spool concept a few years ago. I printed a well reviewed spool, bought a refill, and the refill was wound around a smaller radius than the spool so it wouldn't fit. Sounds like that hasn't changed much?
Fuck any manufacturer who makes their own standard. We have one. We don't need a new one. Vote with your wallet. Unless the manufacturer specifies they are compatible, don't buy it. Simple and easy.
That's the thing, is there even a standard? The thing that got me is everyone saying "master spool", which makes one think that you can print any "master spool" and buy any "master spool refill", but that is not what I experienced.
Master spool standard has mesurements the refill is supposed to fit in. The spool is printable on a 200x200 bed, that's why it's so popular. Every website I have seen, they state ckearly when compatible so idk.