Remixed the adjustable Z End Stop designed by jannoke.
You will need 2x m3 nuts, 1x m3x25 or longer bolt, and 1 spring (stock bed spring size).
I've printed most of the Z End Stop for the  Ender 3 and  Creality printers on thingiverse, and was in the process of designing my own in Fusion360 when I found this one. It was very similar in overall design that I wanted, so I found it easier to just remix his design.
I've actually made quite a few changes, and printed like 5 or 6 variations of it before I got something close enough to what I wanted. As a result the base and slider both are not compatible with the original. I found that the original design had too much play between the base and slider for what I wanted. So what I did was:
Reduce clearance between base and slider.
Add a back wall to prevent any possible twist or flex and make sure limit switch never touches the aluminum extrusion.
Increase length of slider and adjust base to compensate
I also made some cosmetic changes. I wanted it to look a bit more…