Replacing Top Cover
Caution: Use proper anti-static precautions when performing this replacement. Discharge static electricity before beginning. Work on a static-free surface.
This service document will outline the steps to replace the top cover of the extruder on the Dremel 3D40 3D printer. The top cover consists of the extruder cover and a runout switch assembly. The runout switch assembly senses the absence of the filament while printing and pauses, so that the user can load a new filament to continue printing. The user will need to replace the top cover if the printer shows a filament runout error but the filament is still going through the cap into the extruder or the printer does not have filament, but continues printing in the air.