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The printer is connected on the wifi, not the PC.I have a brother HL-L8260CDW. It doesn't have any cables in. I have it set up on my deco mesh, which requires me to be connected the deco network before it'll find it on my PC. My PC is connected via LAN, so maybe I need to reconfigure the printer to use the main routers network directly instead (its right below the printer, so signal strength is fine ). I'll have a look at that once this power issue is sorted. One thing at a time haha
Just the one that I got with the machine: Wireless Network Card WIRELESS INTEL® Wi-Fi 6E AX210 2,400Mbps/5GHz, 300Mbps/2.4GHz PCI-E CARD + BT 5.0
The deco mesh is extending the routers wifi, so connected to the router
The PC is able to print to it as it's connected on the LAN to the same network.
You don't need any wifi card for what you're describing.