Most printers are Wi-Fi, not Bluetooth. I do see a few available, but those are designed for a phone to connect for direct printing. I suspect your Roku is seeing the WiFi that the printer has for devices to connect to it. Very few Roku devices support Bluetooth, and those are only enabled for audio streaming, which is a different protocol than wireless printing. A Roku simply can't see any Bluetooth device as a network connection. It doesn't contain the hardware required.
I believe the Ultra (4800) and the Streambar player/speaker devices are the only current models that support Bluetooth audio streaming. Roku wireless speakers also support Bluetooth audio streaming, but those will only connect to a Roku TV.
Dan
Roku Community Streaming Expert
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