Infinity Bed Flatness Test

I made this to see if my printer bed was flat. This is 0.2mm thick with 0.4mm wide lines. This thickness was the lowest I wanted to test for my Da Vinci 1.0. The width of the lines was the lowest that the slicing software would detect reliably (it takes a lot longer for the slicer to solve this than you would think, 8 minutes plus for me).

It can take an hour or so to print, but it does look cool once done, almost like a tunnel going off into infinity (thus the name).

I was able to deter