I have seen several models of the machines that print 1 at a time and have read Book Business, by Jason Epstein. It is possible to print 1 at a time in black and white, but the covers have color restrictions in full color.
We have to come up with a generic cover. It has a shirt.
The fund is part of the publisher’s catalog. We paste the title and author by hand on each book when it arrives from the printer. Sweet Tania helps me. It is a plastic label printed with a label maker.
I pray that the labels don’t peel off, but I’m telling you, they stick very hard. At the slightest mistake, they stick to your fingers and you can only get rid of them by rolling them into a ball.
Here is an example.