I went through the LCD settings and turned the paper size check to 'off' and this fixed the issue.

It was being thrown out or fed through, and on the occasions it did feed properly, the image was printed small or part missing. In my case it is Brilliant Museum Satin Matte White 17inch wide (truly outstandng paper incidentally). If this is set to 'on' as it was on my printer, it seems to conflict with some papers, margin settings and custom paper sizes. The 3880 has a setting buried within on the printer's LCD control panel called 'Paper size check'. This suggested the printer may be the cause so I looked at the LCD menu settings. I then got a windows machine and tried this with the same results. I set all the margins to this and it part fixed the issue but print output was only slightly smaller. Custom paper sizes on OSX 10.6.x need a minimum margin of 0.2in otherwise when sending data to the printer, there is some arithmetic at work that fools the printer into printing the output small, or part of the image missing. The Epson driver doesn't support borderless printing on custom sizes though, and this gave me a clue. The 3880 will print up to 17x37.5in as standard with the Epson driver and I've printed lots of 37inch panos on this printer.

For some reason, it started playing up in the last few days. Just to confirm, the driver is ok and I've printed on custom sizes no bother before. It only happens on 17inch wide papers custom size and other issues with fibre/thick papers. I've figured it out so this is for anyone else experiencing the same problem this is the fix below.

Rip software for epson 3880