H) Leadscrews and Z Yokes

Install the (3) 1.8 degree Z steppers into the bottom panel using (4) M3 x 10mm button head bolts per stepper. The connectors should point towards the right side of the printer.

It's important the Z towers are positioned on the correct side of the steppers, as is shown in the picture.

Skip this step if using an aluminum base plate

Insert (5) M3 x 10mm Hex Head Bolts into the bottom channel of one of the remaining 425mm Extrusions.

Lower the extrusion to the bottom panel so the bolts go through the 5 holes that go front to back in the panel, near the left side steppers.

Secure the bottom panel brace using (5) M3 washers and (5) M3 nuts on the bottom side of the printer.

Repeat this process for the brace on the right side of the bottom panel.

Install the (3) Leadscrew couplers onto the Z stepper shafts. The couplers should be fully seated and tightened.

The Couplers are silver, with colored plastic combining the two halves.

The third stepper on the right side of the printer is not pictured.

Install the (3) Z Yokes onto the Z carriages using (4) M3 x 12mm Button Head Bolts each. Note the orientation of the yokes in the pictures - ensure the hole for the leadscrew lines up over the stepper.

For Misumi linear rails, use M3 x 10mm instead of M3 x 12mm bolts.

Prepare the anti-backlash nut for mounting onto the leadscrew.

Thread the bottom half (with the flange) down onto the screw until just the teeth are sticking up past the end of the leadscrew.

Put the spring on the bottom of the leadscrew nut and hold it there until the next step.

Insert the top of the leadscrew nut, pushing down until the teeth in the upper and lower parts interlock.

Thread the nut assembly onto the leadscrew, until it's about 1/3 of the way down.

Repeat the above steps for the other (2) leadscrews.

Insert the leadscrew down through the hole in the yoke, and into the leadscrew coupler.

You may need to slide the Z tower around to line it up so you can get the leadscrew into the coupler.

Tighten the grub screw in the coupler.

Insert (4) M3 x 12mm Button head bolts through the bottom of the yokes, and into the holes on the leadscrew nut flange. Do not overtighten, you can strip the Delrin.