Adjustable Z endstop mount for Sunhokey Prusa i3

Simple replacement for the stock Z endstop mount for Sunhokey Prusa i3 printer. Useful for situations where shorter hot ends are used (e.g. E3D v6) and the stock part is positioned too high for the hot end to reach the bed.

Features:
- Adjustable one screw fixing (the original M3 screw and nut can be used)
- Attachment holes for the stock end stop switch (needs longer M3 screws though)
- Form that prevents the mount from rotating even if it is attached only with one screw

NOTE: The part probably doesn't work with the stock hot end & X carriage (I have used it only with E3Dv6).