Designed an easy to print spool held together by M3 screws. No supports necessary. Master Spool standard.
STEP and STL here: www.printables.com/model/548770-master-spool
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You can’t just go around calling yourself a master spool. You have to go through years of spool apprenticeship then serve as a journeyman spool before you can take the test to become a master spool.