AX1800 WIFI Router - I just inSTALLED THE ROUTER - WORKS FINE EXCEPT MY PRINTER DOES NOT PRINT

> AX1800 WIFI Router [...]

   "AX1800" is a speed, not a model number.  Look for "Model" on the
product label.  Firmware version?  Connected to what?

> - I just inSTALLED THE ROUTER [...]

   Brand new installation, or replacing some other router, or what?

> [...] - WORKS FINE EXCEPT MY PRINTER DOES NOT PRINT

   How much do you expect the non-psychics here to know about your
(unspecified) "MY PRINTER", or how it's connected to anything, or how
it's configured, or how you tried to use it from where?

   "DOES NOT" is not a useful problem description.  It does not say what
you did.  It does not say what happened when you did it.  As usual,
showing actual actions (commands) with their actual results (error
messages, LED indicators, ...) can be more helpful than vague
descriptions or interpretations.

   If you have some (unspecified) computer/device which is expecting to
find your (unspecified) "MY PRINTER" at some particular IP address, and
you didn't reserve that address for it on the new router, then your
(unspecified) computer might have trouble communicating with it at its
new/different address.  As usual, many things are possible.