Plug-in-Power?! I asked myself the same question. I know of Phantom power for microphones and I know of microphones that require no external power, but
Some slicers, like Slic3r, have a built-in feature that allows you to send gcode files directly to OctoPrint’s queue without saving and uploading manually.
Leaving a 3D printer unattended is not very smart, especially a homemade one. If you’re lucky, you’ll only mess up a print and waste some