Mendel max Z endstop

These endstops work on the MendelMax with the x-ends I happened to use. Really I think the plunger should be integrated into the X-end, but I didn't feel like reprinting the whole end so I made this.

v2 will fit more bots without crashing into the z-motor mount.

Also take a look at this excellent option: http://www.thingiverse.com/thing:28554