Adjustable endstop for modified Z-axis on ShenzenTech Printer

A small modification to add an adjustable Z-Endstop to my modified ShenzenTech Printer.

NB: The picture shows the first version of the classic Shenzentech's motor plate; the stl of this version is better sized (longer on X axis and shorter on Z) and the smooth rod is aligned with the screw rod to conform with other modifications I've done to match classic Prusa design (rod alignment and spacing)