Tronxy XY-2 Bed knobs
thingiverse
The original bed knobs are a tight fit and don't stay put very easily. These CR-10 scaled-down versions provide plenty of clearance to clear the sides with a hex for the nut. I always insert a metal washer between the bed and knob, then apply a small drop of hot glue to act as a makeshift "lock nut". This keeps the knobs from spinning freely.
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