This is a rework of a Y-axis endstop. It looks like the one I had was based off this endstop (http://www.thingiverse.com/thing:82631). I needed a spacing of 30 mm for my printer so I redrew the part in Fusion 360. I left the slot as a through hole to allow placement on the left or right side of the printer.
Part will most likely need to be rotated 90 deg. about X axis is your printing software. For some reason projects designed in Fusion 360 on the TOP plane are 90 degs out when I load them into the printing software.
Printed with MatterControl 1.5 Basic settings with above resolution and infill.
Printed with $5 filament's Rainforest Green Adv. Ingeo PLA