Lockring with M3 Nut
thingiverse
Original part from https://www.thingiverse.com/thing:4645955 The lockring adopts M4 nut but the recess hole on Y-rail doesn't seem to accommodate M4 screw. So I've made the lockring for M3 nut. When slicing, put a script to add a pause at height 4.10mm, put the M3 nut in and continue.
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