After removing a USB device, such as a printer, for the system to "see" it again, you may need to either reconnect the connecting cable or restart the device or computer. If these options are not possible or desired, you can instead update the hardware configuration in Device Manager. The system will re-detect all connected devices.
To reconnect a USB storage device that has been disconnected using Safe Disconnect, see:
Reconnect the removed USB drive programmatically