It isn't just 'print whatever the consumer needs'. It's

- Dig it out of the ground

- process it

- Fabricate the unprintable bits

- Store all of this

- Print whatever the consumer needs in less time than it takes to drink a coffee.

So unless this make believe "shop" is fronted onto a processing/fabrication plant, which is itself, fronted on a magical mine that you can dig up any resource you like. Your scenario can never happen.*

* Or we could invent teleportation.