Or rents a printer for one-off designs. Unless you 3d print on the regular it's easier to pay someone to print one-off designs. You get a printer that gets regularly used and services and a knowledgeable operator. Not at all dissimilar to fancy commercial sign printers. In a past life working at $large-uni we really did try to make those damn things self-service but it was so much easier for the staff to be the print queue.