This THING is a remix of another design of mine: http://www.thingiverse.com/thing:2111212
I've included a inductive sensor mount, since I use one for bed autoleveling. There are 2 versions of mount: One for 12mm inductive sensors and another for 18mm inductive sensors.
Both designs are Y axis aligned.
The X axis offset for the 12mm version is 31mm
The X axis offset for the 18mm version is 34mm
With those informations it will be easier to set firmware calibration for bed autoleveling.
16/02/2017: Files uploaded.