Belt holder with M3 nut tightener
thingiverse
I was utilizing this belt holder but it started coming loose, so I supplemented an additional component to secure it with a sturdy M3 screw and nut to tighten effectively. https://www.thingiverse.com/thing:1780636 M3 screws of 8mm or 10mm length can be used, and you might consider placing a washer between the screw for added stability. I resized and updated the design to accommodate the placement of the nut.
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