WARNING: The hotend and heatbed are very HOT. Do not touch these parts!!!
For the following steps, it is necessary to have the heaterblock and the hotend clean from the remains of the filament. Otherwise, it can be difficult to release the nozzle.
If you have a Prusa hotend sock on the hotend, remove it.
⬢On the printer screen, go to Preheat and select the latest used material. (e.g. ABS)
⬢Wait at least 5 minutes. The remains of the filament must be warmed up slightly so that they can be removed more easily.
⬢Using the brass brush, carefully clean the heaterblock and the hotend from the filament residue. Avoid contact of the brush with the hotend cables, as this could cause a short circuit.
⬢When the heaterblock and the hotend are perfectly clean, cool down the printer. On the screen, navigate to Preheat -> Cooldown.
Wait until the hot parts are cooled down to ambient temperature. It takes approximately 10 minutes.