Locking screw master spool for refills

Hi, I've seen a lot of burst refill spools recently. I wanted to avoid this with my first refill and modified a multi-spool by inserting 3 holes for locking screws. (I usually only use one screw though)As with most other solutions, the spool is closed in on itself, the screws then only serve as a safety device in case the printing part should give up.In the meantime I have made 2 versions: one with heated inserts and one where the nuts are printed directly into the spool. (The pause is already defined in the printing profile)Be aware that the nut is printed into the spool. The pause should be already in the profile, but please double-check.To screw them together you need at least one countersunk screw M4x60 and 3x M4 nuts or 3x inserts.One spool is using around 125g of filament (the printing profile shows more as both versions are included) Any questions or requests? please just ask!Got support, poop and failed prints? Recycle it!