HELP! Bit drags during carve... something wrong with z-axis?

[NeilFerreri1]

I’d replace it with a screw with a head on it. Just make sure it’s long enough to reach the shaft, but not too long so that it interferes with anything.

Why you should use M3 socket heads and not M3 set screws

A quick word of warning with those using the stock Z axis: too long of a screw on the ACME pulley will cause it to hit the bearing retainer screws. I used 8mm screws and every stepper pulley was fine but the ACME pulley was not. I ended up changing the bearing retainer screws to be shorter to use the M3 socket screws. You could also use a shorter M3 screw for the pulley.