Will all routers with a USB port accept USB printers for the network?
You need to read the features list / manual, etc. for the router to check, because the mere presence of the USB port does not say why it is there. Some might be using the USB port to allow attachment of computers that do not have a NIC or wireless adapter. And, as the previous reply said, if they do claim to support printers, you need to check WHICH printers.