Startup Idea : Printer Cartage Refill Notification

Everyday, We are using printer, and when cartage will be finished we need to manually call the cartage refilling person to inform them to fill up the cartage, we can create a feature where printer sends a notification to printer owner that your cartage is about to empty and along with that we can launch a subscription module where owner can subscribe for the yearly contract so in that case user don't need to worry when his cartage will be empty, when is about to empty, it will send the notification to the cartage refill guy and he will come and refill the cartage.task was done easily. we can do this kind of stuff for various things, like for papers.