MPCNC Primo J - Z Motor Thrust Bearing
Description
The stock MPCNC Primo design uses the z stepper motor axle to support the weight of the z gantry. I designed this modified z motor mount to add a second thrust bearing on top of the z coupler. This takes the load off of the stepper motor shaft. It uses existing part from the Primo, in addition to one 608 bearing and a 6mm ID washer. I printed in PETG-CF, but PLA and others will work. No supports are required to print etc. Assembly: First, press a 608 bearing into the mount, and mount the z motor to it. Install the 6mm ID washer over the shaft, then the spring coupler. Press firmly up against the 608 bearing while tightening the coupler set screw to the motor shaft. Now install the lead screw on the coupler. Do so such that the screw touches the motor shaft, and pull a little bit of tension on the spring as you tighten the set screw (the tension ensures they remain touching). Next fit the lower z thrust bearing mount (with bearing installed) on the z tubes. Then slide the lead screw through the lower bearing, and fit the z mount onto the tubes. Tighten the z motor mount once it is in position (move the lower thrust bearing down if it gets in the way for now). Now slide the lower thrust bearing upward so it seats firmly against the bottom of the coupler. Tighten the bottom thrust bearing mount. When done, the screw should have zero vertical play in either direction, and the leadscrew should still turn freely. If you haven't installed your spindle mount already, do so, then slide the gantry down into the core, and turn the leadscrew finish dropping it in, resquare/tighten the machine, and enjoy!
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