8mm Rod Z for SimpleCoreXY Legacy with Ein Geared Z
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quick and dirty tinkercad mod for Ein's geared z brackets to take 8mm rod/lmuu8 bearings instead of MGN rails
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Pictures are version one in which the belt geometry is off (you can see the belt pulled in). attached files run the slider full height, and the face of it 5mm closer to the rod (should have the belt straight/much closer to straight).
Needed are 3 of each piece, Motor mount will need to be mirrored for one (I forget if its left or right, really doesn't matter other than orientation of the wiring off your steppers). The rest is Ein's files for Z. The geometry on the rod mount ends up with using an m5 washer between the 20t pulley and 80t pulley side bearing, and both of Ein's spacers on the other side to allign the pully with the with the rod/bed mount.
Sliders just friction fit the LMUU8 bearings, you could put 2 in each if you choose, but mine is doing fine on one each. If they start to shift, I'll just use a dab of hot glue above and below to hold them in place. You will also need 4 m3 heatserts for each slider.
The flex in the rod is enough to not need fancy kinematic mounts, I'm running a 235x235 ender 3 bed that I drilled a hole to 3 point mount on silicone bushings to the 2020 “T” that is bolted straight to the bed mounts, and it takes approximately 5-10 mm of z difference in the steppers to bind up the rods.