An Apple Airport Express can join a wireless network as a client. It will pass the WiFi traffic to the ethernet port for your printer. You can also plug some PC speakers into the Airport to play tunes via AirPlay. Multitasking at its finest.
I have a bunch of the older wall-wart-style Expresses laying around. You may have some, or know someone who does. Be warned that only the 802.11n models will pass WiFi to the ethernet port when in client mode.
Nobody notices the Apple WiFi devices, despite the useful modes and features they often have
I used an AirPort Express for linking a wired network printer onto a WiFi network last year, worked well. Config was done using my iPad (Airport app) but could have been done using a computer.
The USB port on the Airport express has some uses too.
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