Marlin firmware fork for MakerFarm i3v w/ auto bed level & Roxy's enhancements

[AbuMaia]

For the mintemp, I'd check your hotend thermistor wires, make sure they're not shorting together.

As for the octoprint, I don't think that's a Marlin problem. Reboot your octoprint (octopi?).

[printbus]

For the mintemp, I'd check your hotend thermistor wires, make sure they're not shorting together.

Actually, mintemp would be an open connection. The thermistor resistances go up with colder temperatures. So, assuming no wiring changes were made, maybe there's a configuration problem with the input that is being sampled for that temperature.

EDIT: Here's a resistance vs. temperature plot for the typical EPCOS thermistor...