Red River Paper has posted a revealing report on the cost of ink used to make standard size prints on several Epson printers. For those of us making the transition from conventional to digital printing, this can help us and our students place a monetary value on our prints. I’ve never encountered an analysis of chemical costs per print, but you can at least compare the cost of in-house printing against outside lab costs.
This report does not include the cost of the printer. You may want to amortize that cost over its useful life (perhaps 4 years) and divide it by the estimated number of prints that will be fed through.