Acrylic Hictop i3 bed leveling thumb screw - 16.4mm
thingiverse
I've found all the thumb screws here have had some issues. This one looks like a winner, but they're thinner so they can fit over the front piece of acrylic holding the Y-axis rods without a problem. It's thin enough to slip right past it. Use the 20.5 mm screws on the front two bolts and the 16.4 mm thumb screws on the back two bolts - designed to grip tightly onto M4 bolts and nuts.
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