I searched the internet for a corner protector that I can also use for a small cabinet with drawers.
Unfortunately I didn't find anything useful, all the products were too high and would have blocked the drawer.
So I created a "flat" corner protection here with a height of 15mm (inside).
The protection can best be printed upside down without support and then simply attached with double-sided adhesive tape.

I hope this can help others with the same problem.