Simple USB Switch: 4 Steps - instructables Prepare the Case: this will differ depending on what you use, I used an old power brick. Just make Wire the Switch: Now the switch needs to be wired. It doesn't really matter what order the wires are Test!: Make sure double check the wiring before testing! It's a good Idea to test this before you put Assembly: Now put your USB switch in it's case and your done. Add TipAsk USB Switch - Electronics DIY USB Switch. USB switch is used to share USB devices such as printers, scanners, hard drivers, etc. between two computers. Just connect the two computers on a network device and say the printer as shared. This method however requires the continued operation of the computer we plugged the printer.