I tried printing on a 500g rag paper the other day and found out that was too thick for the z3100. Went through the rollers fine but had some head strikes. I can't find any info on the max paper thickness. I know papers vary quite a bit so any info would be a ball park figure. What are people printing with for thick art papers?
I don;t know the max thickness is either, but if you have too much curl on your paper you will get marks on thicker paper
that is my experience anyway