Maker Farm Prusa I3V Z-Axis End Stop Adjustment V2

This is an updated version of the previous Maker Farm Prusa I3V Z-Axis End Stop Adjustment (http://www.thingiverse.com/thing:888129).

This new version uses a fine adjustment screw in order to accurately position the nozzle above the print bed. The fine adjustment screw is a 1/4" screw with 80 threads per inch. The fine adjustment screws can be found here: http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=1207. Since this screw has 80 tpi one revolution of the screw is equivalent to