5100 hours on this printer. I suppose my print bed might be just a little janky...

I've been having z homing issues. But only when printing ABS. I tried the strain relief on the sensor cable. I adjusted the screws on the print bed. In catching this failed first layer, I think I'm starting to see what the real problem is now.

I'll wager those oddly regular shapes I see are mechanical parts that have drifted from level. At least at 105c