Adjustable Z Endstop for Prusa i2

Bolt version of [ctheroux adjustable endstop](http://www.thingiverse.com/thing:162301/). Very sturdy and does not move at all. Works only for the X version with holes between smooth and screw rods.

You'll need:

2 x 25 M3
1 x Spring
3 x M3 nuts