Rehome absolute coordinates on 32ft x 16ft x 9ft gantry-style 3D printer

Long time user (10+yr), first time poster...I'm looking for ideas and suggestions outside the box.

A group of us built a 32ft x 16ft x 9ft gantry-style machine for 3D printing. Yes, feet.

We have a small drift of the absolute coordinate system in the positive X direction which changes with length of the print path.

I'm not so concerned with 0.1 inch error over 32ft, but an accumulated error over 100 layers is 10 inches.

It would be nice to just rehome absolute X after each layer. But everything I've seen on the forums says I can't home to the switches inside the G code.

This seems arbitrary. It's certainly software-enforced.

- Could I parallel connect the X limit switches to motion.probe-input in the .hal file? Then run a G38 and a G10?
- Is it possible to do something like this in python?
- I suppose I could mod G28. (last resort)

We've already reduced this problem by an order of magnitude. We're just looking for something so we can move forward with bigger issues and revisit this later.

Any ideas?

Thanks!

We are actively addressing eliminating this issue, and have reduced the problem by nearly a factor of 10. It's just that we don't want to halt programming, live testing, etc.

This line of investigation is purely a stop-gap to continue to move forward.

FWIW, we believe the problem to be asymmetric loading, complicated by the overall size of the machine.

...I mean, children are building gantry devices with Lego, how hard can it be to make one a couple orders of magnitude larger?

Thanks!