This is a simple, fully customizable, and adjustable Z-mount for the Ender 3 printer. I was tired of Z-axis binding and I couldn't find a good Z-mount that I could easily adjust. The attached openSCAD file has all the parameters you need to adjust the thickness hole diameters and adjustment limits. I also like this design because you don't need to remove the x-axis to install. I may thicken up the parts after testing for a while, but so far so good.
##This does not use the stock countersunk M4 screws. I'm using button head M4 and M3 screws.
### How to use the fudge factor variable in the SCAD file for best fit Print off the piece and mount the Z-stepper to the frame and tighten the screws. If you don't have a gap between the bottom extrusion and the bottom of the stepper then great. If you do, then you can measure the gap with feeler gauges and change the fudge factor to match. I had a 0.45mm gap and after inputting this into the fudge factor the stepper is tight on both Z and Base extrusions with no gaps.
### How to get a good alignment 1) Install Z-mount to stepper. Screws slightly loose 2) Attach Z-mount to frame. Screws slightly loose 3) Tighten your coupler and make sure their are gaps between the stepper and coupler and stepper and threaded rod. 4) Make sure your Z-axis is towards the upper limit and then move it up and down a few cm until its smooth. Tighten the frame screws and repeat. Tighten the stepper mounting screws one at time while moving the axis up and down a few cm. 5) After your first print you may need to tighten everything down again.