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How to Make a Printer Wifi
Even if the printer being used is a USB connected printer, which most printers were until recently, it can still be shared over a wifi connection.

The printer will still need a host machine to be connected to via USB, but all other connected machines may share it. Make sure all machines are connected to a wifi network. Connect the printer to the host machine via the included USB cable. This host machine will need to stay on for the printer to be accessible through the network. Install any necessary drivers and software to all machines and turn on the printer. Open the "Start" menu or the Apple equivalent and open the printer control panel, named different things depending on the operating system being used. Locate and right-click the icon or name of the desired printer and click the option that allows sharing. A pop-up window should come up with an option to confirm the action. In most Windows applications, users must click on a radio button. Enter a name for the printer in the necessary field. Click "OK" to save settings and enable wireless sharing. Using the name for the printer, other machines connected to the wifi connection should be able to print to the printer through the host device.

Converting a printer to wifi saves time and money where possible and recycles the currently used printer for a longer period of time. These instructions are most applicable for a Windows based operating system, but there is an Apple equivalent that follows similar instructions as computer operating systems are not as different as they seem.