I had a similar issue where it was thin in regular intervals similar to what it looks like in your pics, the issue I had was the extruder gear was clogged up on one side so it wasn't gripping the filament and slipping until it spun around to the unclogged side and it would extrude normally again.
Look into NUT, Network UPS Tools. It runs in a server/client type of set up. You'd install the server onto the device that has the UPS data connected to it. It then monitors the UPS status and can tell all the clients to shutdown when the UPS is running low.
I had a similar issue where it was thin in regular intervals similar to what it looks like in your pics, the issue I had was the extruder gear was clogged up on one side so it wasn't gripping the filament and slipping until it spun around to the unclogged side and it would extrude normally again.