Lukas Beeler's IT Blog

After newly installing ExcelliPrint for a few new Epson printers at a customers site, we had a strange problem: Everytime we printed a single page, the printer tried to duplex it. I checked the PRTF to make sure that duplexing wasn’t enabled, and it wasn’t. Yet the problem persisted. Printing from Windows directly did not yield a duplexed page, so i was a bit stunned.

Could this be a bug in ExcelliPrint? Doubtful, the symptom is just to strange for a programming error.

But the solution was very, very simple: When i looked at the printer configuration (through it’s Web interface), duplexing was enabled by default. I disabled it, and Windows and ExcelliPrint could print single pages without problems, and both Windows and ExcelliPrint could enable duplexing without problems too.

I would assume that the problem is that the Windows printer driver sends an explicitly disabled duplexing option, while ExcelliPrint only sets the duplexing option when you enable it in the PRTF.