SpinLock Collars Screw Clamps for barbell bar
thingiverse
SpinLock Collars Screw Clamps for 1" standard barbell bar (in EU the thread is 30 mm, pitch is 6.35 mm = 1/4 inch). Don't print it from PLA, it will be OK a year or two, but it may became too brittle and the holder may break suddenly. I printed mine from ASA, since it will be used outdoors. I used 3 perimeters and 50% infill. In my testing even the 3D printed M10 nuts can hold over 100 kg weight, so this should be fine with 2x5 kg (I am using currently).
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