Geeetech

I figured it out! After about 4 days of head-scratching, starting over... I finally have success.

First, I had the wrong sign on the offset. This caused havoc in the centering, auto leveling and Slic3r. Should have been -51 not 53 (remeasured and found it to be 51mm.)

Secondly, comes the confusing ...

I have added an inductive sensor and am having problems configuring the Marlin firmware. The probe is centered 53 mm behind the extruders. I am using aluminum foil strips under the glass bed which triggers correctly when it stops over them.
I have a couple of problems that may be related.

1) To ...