either the paper is bending inwards towards the coating (and that can happen in dry environments) - and is catching the print head.
go for the paper first as it’s easy to gently roll back the four corners and edges (don’t dog ear the paper of course…) - just try to get it to lay flat. see if that makes a difference.
or the capping station or wiper blade is leaving gunk behind on the print head. had you been running a lot of cleanings on this printer?
But did you check to see if the blobs are there with just ordinary inkjet paper or is it related to the slightly curled edges of thicker fine art paper?
well that’s good news. the paper is probably curling up from lack of humidity. so do what i told you a couple messages ago and make sure the paper is feeding in flat or slightly curled to the back…
just finished another print session and while most prints were fine, 1 print had those ink blotches on Hamm photorag 308 in the same spot as last time.
this time however I just ran 1 cleaning prior to printing, so it wasn’t like I was doing many cleanings before printing.
this is very common with thick paper and Epson printers when the paper is curling to the inside. As I mentioned earlier - did you examine the paper to see if it is flat or if it has a slight curl towards the print side. If it does, the paper feed can not fully hold it down and it’s edge can catch the print head. that is the source of the blobs. and i told you how to remedy that.
You can also widen the platen gap when printing on heavyweight papers, such as 310gsm Type 2 and 308gsm Photo Rag. If you have the issue with the thick papers, but not with thinner weight papers, then I suspect widening the platen gap will help.