When selecting a 2-port USB 2.0 printer auto-sharing switch, consider the following extra quality features:
Drivers for these switches are often "in-box" (built into Windows), but the auto-switching utility must be downloaded from the manufacturer's support site. GUB231 - IOGEAR 2-Port USB 2.0 Automatic Printer Switch When selecting a 2-port USB 2
For the most reliable "Auto Switch" functionality, download software directly from these popular brand support pages: When selecting a 2-port USB 2