So I usually print off one of these every time I get a new filament. I used to use all 3dsolutech with zero issues for years. Then I stepped away for two years and now I find they seem non existent. So I went with hatchbox. I just got done with an entire spool of their white with no issues- arguably the best prints I've ever made. Switched to a roll of black and I got this. What is the terminology for the artefacts at the corners and base of each temp and what not? What can I do towards correcting it? Emphasis on the fact that I just burned through an entire spool of white without seeing any of that on the temp tower or prints so I shouldn't need to go changing a million things as my printer is/was mostly dialed in.

I never had this issue from roll to roll of the solutech stuff; is this pretty normal when you go from color to color?

Thank you for your time and knowledge should you choose to share it.