I worked at a place that had the (IMHO)
horrible habit of never turning down print jobs, people would bring in rough cut lumber nail together, old rusted tin, ect.
All it would take is one mistake of not noticing a nail sticking up & you just trashed $20k of print heads in a second... The funny thing was, when those type of jobs came up, the lead printer at the time would be way too busy to run it, so it was dropped in my lap, even though any other time he wouldn't let anyone else run that printer.