This is a way to sync the Z-axis drive using a single motor.
- plateL.stl - top left plate, the motor and idler are mounted here
- plateR.stl - top right plate, essentially a mirror image of the left plate, but without the motor and pulley.
- rod_plug.stl (print 2) - replaces the original guiding rod plugs on top plates
- rod_holder.stl (print 2) - holds the guiding rods from below, since the motors aren't there anymore
- tube_guard.stl (optional) - keeps my bowden tube from interfering with the timing belt
If you prefer the motor on the right, you can print mirror images of the plateL.stl and plateR.stl.
The mounting holes for the flange bearings are a bit oversized so you can keep the leadscrews and the guiding rods parallel. The way I did it:
- Mount the flange bearing without tightening the mounting screws
- fix the leadscrews in the bearings
- bring the X-axis assembly (the one that rides on the leadscrews and rods) all the way up (maximal expected Z height)
- ensure that the leadscrews are parallel to the guiding rods (I eyeballed it, by keeping the bottom of the leadscrews above the Z motor axes, which were yet unmounted at this stage).
- tighten the flange bearing mounting screws
Don't forget to change the steps/mm parameter for the z axis (from the original 400 to 800)
Hope I included everything here. If you find anything missing, please comment and I'll answer/update.