Can I send a print from my PC over the internet from a different

Can I send a print from my PC over the internet from a different network?

GCodeprintr is just listening on port 2323 on the IP address of your tablet/phone. Therefore if your router is configured to route this IP through the internet you could send a print from outside.
However, I do not recommend to do that because
there is no authentication required to send a print, therefore anybody could control your printer.