Wanhao Duplicator i3 (Di3) Plus Adjustable Z Endstop

The [one made by evadeninja](https://www.thingiverse.com/thing:906366/#comments) was for the Duplicator i3. The plus model has a slightly different Z end stop setup. First there are multiple mount holes in the frame, so you'd think that an adjuster piece like this would be unnecessary, but for some reason, only moving up one spot on the frame would set the Z stop above the limits of my bed levelers. The M2 holes on the switch itself were also spaced slightly further apart than originally, so thi