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Thanks Trogeir for your quick reply! I think i figured it out! At first, I testet the Fans, but they seemed to be working. But thanks your input i was almost sure that it was a cooling problem. I run my UM3 in a Box, which is not very well ventilated, and it was getting warmer over the last weeks, and the dents in my print were always on the same side (still haven't figured out where exactly because my print is round/symmetrical and i always forgot too look before taking it off, i think it's in the back). So i tried leaving the doors open, and printed (as you suggested) without heat bed on blue tape. Now the prints are perfect! THX for your help!

I have exact the same Problem... did you find out anything yet? would be a huge help! regards, a.