I only need a 3D printer in rare occasions, which does not justify buying one.
So I would like to get easy access to one.
Take a better, faster, more expensive printer.
Put it in a vending machine like case and sell the printing service by time/volume maybe?
Couple it with a 3d scanner, so I can scan in some part I need copied / remade right there. But also make it possible to remotely queue jobs and then pick them up at the store later when they're finished.
I am imagining somthing like a postal package station, only the stuff you can pick up is being made right inside the machine.