Displayed temperature jumping while printing for a long time
Your temperature is not just bumping up 10 °C. Your hotend is fluctuating in temperature, it drops under and increases over the &quot;set&quot; temperature. The hotend temperature is a result of the amount heat you put into it and how much heat you pull from it (e.g. filament heats up and draws energy from the heater block), apart from a too large printing speed for the heater to follow the energy off-take, this can be the result of one of the following (or combined) issues:

Your print cooling fan position is too high/not low enough, it cools the heater block/nozzle
Your PID settings are not correct

Many hotend designs come with silicone &quot;socks&quot; insulating the heater block and to shield airflow from cooling the heater block.