Geeetech Prusa I3x Z Axis Wobble Fix

thingiverse

I tweaked this design slightly to include a recess for a PTFE bearing plate. Without the plate, the bracket is in direct contact with the acrylic structure, which may wear or create unwanted friction. The PTFE I used was from a sheet 1.5mm thick. The bearing plate measures 17mm x 17 mm, with a 9mm diameter hole through its centre. PTFE sheet is readily available from online stores for a few pounds and boasts a very low coefficient of friction. To ensure these brackets fit on the Geeetech Prusa I3x, you need to lower the couplers as much as they can go; otherwise, the bracket screws will foul the couplers before the z-axis reaches Z0. You can reuse the screws from the original brass fittings and use leftover nuts from the original kit. If you loosen the coupler and fit a hex key to the lower grub-screw, then drop this down as low as it can go before tightening, it won't foul. I took advantage of this opportunity to also replace the couplers with ones that aren't split and have two grub-screws for each shaft - these run a lot truer, eliminating some wobble. I also replaced the sloppy Z-axis 8mm threaded bar with 8mm leadscrews featuring 1mm lead. This thing was made with Tinkercad. Edit it online at https://www.tinkercad.com/things/9jSMEJ You may need to run a drill bit down through the centre to allow the brass nuts to fit snugly, and use a small file to open up the inside width of the 'jaws' so they slide smoothly over the 8mm rods.