Archer AX50 v1.0

I have some devices on my network that I want to 100% block from internet access but still have access to my network.  For example, a printer.  I want to print from all devices but I do not want the printer to access the internet.

I tried parental controls but that does not seem like it is working.  Access controls seem to just keep the device off WIFI.  Any tips for how to configure this??

Thanks!