This is a direct replacement for the factory Z-Endstop bracket. It allows you to adjust the height of the limit switch. I have plans to make a fine adjustment version and will update when I get around to it but this works fine in the meantime.
This requires no additional hardware to install as it uses the same screws that came with the printer.
I did 0.3mm but anything will work
I printed it with the flat side down to the bed.