Dumbbell quick release threaded clamp
thingiverse
I'm currently pumping iron to rehab a shoulder injury, adding more weight between reps, then removing it to repeat mixed sets. As I'm only increasing 2.5 lbs (2 x 1.25 plates), I needed a quick release "nut". So, I combined the "Rod clasp" (https://www.thingiverse.com/thing:2932583) with the dumbbell threads from the "Dumbbell retainer" (https://www.thingiverse.com/thing:3391332/files). The hinge prints in place, it snaps onto the bar, and can be turned to tighten as snapping it on. Kudos to those other guys for a job well done!
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