Hello Eric,
?I had the same issue with Epson SC-P6000.?
?I was using Tecco production SF140 film to print the negatives.?
?I assume the horizontal lines was caused by the substrate being to thin. 140gsm. I have experimented with different media type, creating my own media settings, but nothing helped.?
?I switched to Fomei Clear Film 180, which is 180gsm. Also set the media type to Premium Glossy Photo Paper 170 and Narrow platen gap, which solved the issue.?