Improved y-axis endstop (Mech Endstop) rear mount for Prusa i3

A better Y axis endstop rear mount for all ready-rod style Prusa i3 Printers.

Mounts to both 10mm threaded bars. Uses all mounting holes for Mech Endstop v1.2 (M3) and includes blanks for the solder, pins, and electrical connection to ensure a tight and durable fit.

Endstop mounts to a bracket using short M3 screws w/nuts. Bracket mounts to both lower and upper threaded rods and is held to the frame using frame and nuts. Endpoint trigger is the bed frame (near center) allowing for max Y pr