Any luck with the black printbite? Would love to see some pics of your levelling grids. I have the gridded printbite surface and it doesn't work on that.
I'm yet to decide if it is a dodgy IR sensor, or if it is hitting the grids and causing a strange pattern.
My bed levelling came out as such –
I could rip off my old printbite and buy a new one, or I could get it to only take readings from within grids, but my current set up works without an IR sensor… it is really only to have a digital readout of my bed flatness that I care about so I'm yet to take the plunge. Let me know how black printbite works though and maybe i'll take the plunge