How to share a printer (or any usb devices) to two or more computers?

"No, you can't do that. You need something smart in between to share the printer. Either one of your PCs or a print server.

You don't need to replace your whole router, you can get a device like this for example that you can just plug into one of the wired connections of your existing router.
http://www.netgear.co.uk/usb_print_server_ps121.php

USB peripheral switches are a bit pointless because they are more expensive than a dedicated print server, they arn't 100% compatible with any USB device and can cause many additional problems. With a switch the printer would only be connected to one PC at a time, so you could not queue jobs and this can cause problems with printer drivers that monitor the status of the printer. They are out there but I would not recommend them for sharing a printer, they are more suitable for things like mice and keyboards."

"USB Switch Boxes like this are pretty good for the purpose. There really is no need to throw away perfectly-functioning older hardware for the sake of something you can buy for ten quid/bucks. I despair of our Age's obsession with disposable/obsolete-in-a-year electronics. I am just about old enough to remember when things were build solidly, to last. We had radios, amplifiers and reel-to-reel tape machines made in the 1960s that worked perfectly (and probably still do but have been relegated to boxes in the attic) when I was a kid in the 80s. They were solid and designed to be used for the life of the components. And designed to have easily replaceable components. Compare a Land Rover Defender to an iPhone for example.

You hang on to your printer.

OK rant over ;-)"