How to connect one printer to two computers?

trying to connect a printer to two computers
what cables do I need

Well, that depends on your printer really. I assume your printer pretty much only has a USB connection. If it were to have two USB connectors (sometimes one at the front, one at the back), you just need 2 USB cables (with the corresponding end connectors) and plug them in.

If it has only 1, then it can get a bit tricky. Probably the best way then would be to hook up the printer to 1 of the computers using a USB cable, then connect the other two computers with an Ethernet networking cable. You will be able to 'share' the printer over the network cable, but it might be a bit tricky depending on what Operating System (e.g. Windows, OS X) each of the computers is running.