CNC TAP redrill assist tool from MGN12H to MGN9H

Print it with strong plastic, preferrably at least PETG but not with carbon or glass filler, Voron print settings. Use 3mm drillbit, I actually got it done with wood drillbit as the sharp tip helped to better hold the drill in place. Use sacrificial M3 bolts to hold it in place. Clean the TAP afterwards thoroughly of the aluminum particles and regrease rail and cart. When installing TAP to the rail, you need to have the cart removed. Greased bearings will still stick to the cart even if they are coming out from the groove. I used my pinky finger to hold the bearings in place when working up the cart from the bottom upwards.