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A few thoughts:
If your computers are on the same network, you can share the printer which is connected to one PC with any other computer on the network.
If the host computer is on the internet, you can set up Google Cloud Print, and print from any device anywhere on the internet.
And many recent printers have WiFi built-in, and connect to your home network without even needing to be connected to a host computer at all. E.g. We have an HP PhotoSmart 5520 printer / scanner / copier, which you can buy for about $70 from OfficeWorks, Harvey Norman, etc. It has WiFi connection to our home network (no cable to any computer), and we can print from any computer, phone or tablet at home. It even has its own e-mail address, so you can email it pictures or documents from your phone while you are away from home (e.g. when you are on on holiday), and they will be printed while you are thousands of kms away. (I'm not saying that's a good use of the technology, but the point is that wireless printing is the way to go these days.)
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