Currently Lulzbot is tapping electrically conductive washers with the hot end at the corners of the bed to discover the bed height at the corners.
I wonder if Lulzbot could instead use an electrically conductive PEI print bed w/ leads running to it and tap the PEI bed itself with the hot end instead of tapping corner washers?
Get that working or something like it, then hopefully we can get a Marlin upgrade that will utilize taps across the build surface to create a 3D topographical map that in turn can be utilized to navigate the hot end perfectly across the build surface to create perfect 1st layers every time.
Then we can all spend more time printing w/ our printers and much less time tuning them with failed prints as our guide. This will save money on filament too