@gerograph
Doesn't feature the Fritzbox both access methods? My "Telekom" branded router (+ USB3.0-HD serves) as a SMB-Server and as a FTP server. The latter is my hassle free access method for my Miggy systems.
So - in theory

- the printer could push it's scan result via SMB to the HD and then that could be fetched by FTP from the Miggy.
BTW: I use Ethernet printing since ages, because our "multi system household" doesn't really work with connecting a printer directly to a computer. So I don't know anything about USB or whatever direct connect to AmigaOS systems.