Not sure I've grasped what you're doing. If the printer's in the same room as the router, why not keep it simple and use ethernet?
My printer is connected via Cat 5 cable to a port on the router. It's got a fixed IP address on the network (it happens to be 192.168.8.160).
I can connect to it with no problems from the desktop (on another Cat 5 to the same router), from the laptop out in the workshop (via WiFi to the network), and from the iPad (also WiFi).
The printer itself doesn't have WiFi in it - it doesn't need it.
Visitors who want to print just have to be told that 192.168.8.160 is a printer. Their laptops talk to the printer and agree what drivers are needed, and away they go. iPads are slightly tricker because my printer happens not to be one with the Apple sign on it, but there's a way round that).