Z End Stop for Tronxy X1

Z-axis end stop replacement for acrylic part. My original part was broken, so I designed a replacement. Can probably also be used for X axis end stop. Included is the [OpenSCAD](http://www.openscad.org/) file for easy adjustment / enhancement.

Inspired by: https://www.thingiverse.com/thing:2120675

I got very helpful support from the German user group on FB: https://www.facebook.com/groups/252625328519363/

After the stock Melzi broke I am using now a GT2560 board with Marlin and my own