I have had my TAZ 5 for about 2 months now and it has been working great. I have had it going pretty much 24/7 since I got it and over the last few weeks I have been noticing a change in the surface of the glass bed.
Almost all of my prints have been printed in the exact center of the bed. I have noticed in this area where almost all of my prints are done the bed looks different when the light reflects off it. It appears the edges around the bed (about from the edge to 2-3 inches in from the edge) look kinda dull when you look at it at an angle with with light. However the center of the bed in 3-4 inch area looks very shiny and prints are very difficult to remove even when letting it cool down entirely. I tested printing things on the edges more with no other change in temps or any sort of height adjustment for the Z-axis and prints remove off these spots with little to no effort once cooled.
I have already tried moving my z-axis up some without much success. I do not believe this is the issue since when prints are more toward the corners or edges of the bed they come off effortlessly. I am wondering if perhaps by printing in the same spot constantly or perhaps being too aggressive in getting my prints off the bed I damaged the surface somehow. Perhaps I damaged the PEI surface? Honestly I know very little about how the bed is assembled or what makes it special. I normally let the bed cool down to 20-24 degrees before attempting to remove a print.
I have been printing with PLA at 60 degree bed temp and 205 nozzle temps. I have tried several brands of PLA and that has not solved my problem. My parts look very smooth on the bottom regardless of where on the bed I print them.
Any help would be appreciated.