Which printer connects with gateway b10 router?

With the new gateway b10, my printer won’t connect. Needless to say, the former gateway connected beautifully. An Xfinity technician spent two hours trying to split the wifi to allow the 2.4 Gz to connect. Nothing worked, even with another printer, now a few years old as well. Which printer does this irritates b10 gateway connect with?  What’s going on?