

Slightly harder: add exceptions for bambus servers in your routers firewall so that requests to that domain are blocked
I assigned a static IP address to my A1 mini in my router, and made a firewall rule preventing all traffic originating from that IP from going to the internet. The printer is also in LAN only mode, but I periodically have to reconnect it to Bambu studio which is annoying.
I don’t see an easy way to accomplish this independent of Bambu’s servers, especially if you use the handy app on your phone.