Stronger rear switch mount for MPSM

This is an update of my Z-axis limit switch mount for the MPSM after having the Z expansion mod done with a NEMA motor. I've made it slightly taller and added a gusset to prevent flexing.

The 35mm lift kit is here: https://www.thingiverse.com/thing:2387368

Mount with an M3x6mm screw with an M3 nut threaded on to it because the motor will prevent the screw going all the way through the plate.

UPDATE 2017-09-03: Added a 27 mm bracket for people who only do the 25mm Z axis extension.