Network Printer access from work/guest network

[trendy]

@chris-k

config route
        option target '192.168.178.91'
        option gateway '192.168.178.1'
        option netmask '255.255.255.255'
        option interface 'WORK_1'

Not needed, delete it.

Do you have a static route for 192.168.1.0/24 on the fritz?
I think you have asymetric routing here. Packet from work_1 network goes to OpenWrt then directly to printer. Printer however responds back via its gateway, the fritz, which should forward it to OpenWrt. But it may as well drop the packet as invalid.