said by Sweet Witch:Ok, well, the stupid thing switched itself back to 192.168.1.2.
How exactly do I set a static IP? In the router or printer?
I would look at the router first. I have had several, from an SMC Barricade 7004BR with the last firmware update to my current Asus RT-AC66U, which allow to configure DHCP reservation.
If the router is not so capable (and I imagine only older routers are lacking), you should be able to limit the DHCP range; then manually assign an IP address outside of that range to the printer.