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Converting a USB printer into a WiFi AirPrint printer with 9$

In my home office, I happen to have a XEROX 6130N: it’s a bit old, but works perfectly. It is actually also an ethernet printer, but 1) I don’t want to move the printer close to the router; 2) I don’t want to get a wire from the router to the printer (2 floors are between them); 3) XEROX 6130N was born before AirPrint, so it does not support it, and given that often I read documents over my iPad, it would be nice that I don’t have to move to the PC to print them when needed. So basically how do I convert it to my USB Printer into a WIFI AirPrint printer?