Dear Sir: I am experiencing problems when printing on Lumi Silk 300g Boards. I notice that across the printing there is small tiny oily patches on the print. This only happens on these Cardboards Size 311 x 455. I call the technician he too could not come to any conclusion. We changed the cardboard still there problems exist. I also changed the toner which I used Katun Products with no avail. Help me please Thanks Dalip Bisseru - South Africa