Chris got an Epson Workforce printer, but the iPrint app for printing from mobile devices does not work with his Android phone. It wants to send it to Google Docs as a PDF, but it won't print. Leo says that's not very helpful, and thinks that Google's CloudPrint may be a good solution.
There may also be something wrong with Chris' setup because several people in the chatroom tried it during the break and iPrint works fine. So there may be something going on with his particular set up, and may want to look into that app or his phone.