I have the predecessor ET-7550, probably the worst and most expensive (749 Fr.) printer I have ever had. The prints are top quality, but: Printouts always show streaks. It gets even worse when the printer's print head is cleaned. And without exception. The only way to solve the problem is to use household paper and print head cleaner. Takes a good two hours, a lot of ink and a lot of nerves. It seems that the device uses the same parts as the A4 model, but they are too weak for the longer hoses due to A3. It is always necessary to build up pressure in the ink tanks, then the print head gets enough ink. In short, a fiddle. Have you had no such problems with the ET-8550 so far?