Ender 3 Z axis COUPLER KNOB and bearing shield

cults3d

Designed for the Ender 3 Pro- MAY fit others. Please see "How I designed this" section. You finally found it, a Z Axis knob thats not up at the top. The knob that doesnt require a support that may possibly bind/bend your Z Axis lead screw. You know you have done it, put your hand back on the Z Axis stepper and turned that slippery coupling. Well now put some grip on it! The knob fits fairly well with a very slight slop when you turn it. It has positive engagement so it will not slip. EDIT 12-20-2020 I have modified Base A & B to fit the coupler more snug on both the diameter and the counter bore. I have installed it to my machine and had to use a groovr joint plier to squueze the sandwhich together and lock it all in place. The end result is the knob is tight to the coupler with no slip or wobble. While I was designing this part I couldnt help but notice the stepper bearing sitting down in a pocket collecting garbage. So I fixed that also with Z Step BRG Shield. It fits snug and will keep the trash from collecting. Hey you got rail covers on your ender- why not add this gem too! Assembly onto your unit: Loosen the stepper side of the coupling, then the 8mm screw side. Lift Z axis up, remove coupling. While holding up in the air, put the Z BRG Shield on, with the small round nub going down to the bearing. This should be a nice snug fit. Next put the Top plate over the Z screw, put the bottom plate onto the coupler. Install coupler to the 8mm screw, snug. Drop the coupler attached to the screw back onto stepper. Tighten up both screws properly. Bring the bottom plate up, snap on Base B. Place and snap on Base A fitting it over the socket head screw that grips the 8mm lead screw. Snap top plate down.