Dumbbell quick release threaded clamp
thingiverse
I am currently lifting weights to rehab a shoulder injury, add more weight between reps, and then remove it to repeat mixed reps. As I am only adding 2.5 lbs (2 x 1.25 plates), I wanted a quick release "nut". I simply mixed 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. Nicely done by the other guys!
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