2/24/2020: OctoPrint Anywhere is being deprecated and replaced with The Spaghetti Detective. The Spaghetti Detective is from the same developer and adds new features like automatic failure detection!

Mentioned here How to Access OctoPrint Remotely With the Spaghetti Detective Access OctoPrint from anywhere with this OctoPrint Anywhere replacement.

This guide will show you how to access OctoPrint over the Internet (from anywhere) using the OctoPrint Anywhere plugin, allowing you to monitor your prints from your phone or other remote device. OctoPrint itself is [intentionally] limited to connections over your local network. But what happens if you want to monitor your print from work, the bus, or the coffee shop?

This is where OctoPrint Anywhere steps in. It allows you to securely control the core features of OctoPrint over the Internet without needing to mess with port forwarding on your router. OctoPrint Anywhere is free to use for your first printer, plus $5 per month for each additional printer.