Heatbed - Heatspreader plate issues-
I have been chasing bed leveling issues for a while, it was like trying to corral jello constantly… I even broke down and bought a bed leveling sensor (different adventure). I took of my heatbed and saw my spring keepers had mushroomed and fused to the springs. I had designed a collar with a hex recess to center the spring on the bed bolt. I have some thing similar on my i3 clone, liked it and figured I would put them on the the Eustathios.
I run the bed at 80-85 for PETG, these are PETG. I am surprised that they deformed like this. In engineering speak, we call this creep - ‘plastic flow under load creating permanent deformation’, meaning even under lower than design loads, the material by its nature will set into a deformed condition. Glass does this too. I think this was the source of me bed always being out of level. I think I am going to come up with metal spring keepers somehow.
I also insulated the bed by taking some 1" vinyl faced fiberglass pipe insulation tape strips and sticking it to a piece of cardboard and slipped it between the frame and the heatbed. Some packing tape prettied up the edges and keeps the fiberglass encapsulated.