Bugs involving printers are among the worst, as everything software with them is a few notches down on the quality scale. Also, troubleshooting involves reams o

Bugs involving printers are among the worst, as everything software with them is a few notches down on the quality scale. Also, troubleshooting involves reams of paper or giant rolls of labels. A good test for a printer/print spooler is to set the printer offline, but still accepting jobs (eg: open paper tray), then send 20 print jobs and count how many the jobs get printed. I’ve spent countless hours and a 3’ diameter roll of labels trying to figure out why a printer would occasionally not print&apply a label, causing all packages to be labeled with the wrong label. The printer could print&apply 1 label/second, so it made a lot of mistakes when it failed. We eventually had to dismantle the printer and test each major circuit board in isolation to find out that its internal network adapter had bad firmware that the manufacturer did not want to fix. It turns out that most IP->LPT adapters also have this same flaw too, so we had to basically buy a huge pile of them to find 1 that worked.