I have started a print and the printhead is moving but there´s no plastic coming out, what should i do?


A common cause of under extrusion or no extrusion at all is either something blocking the filament from it´s spool on it´s way to the nozzle. It can also be small parts of filament blocking the entry to the hotend, a drivegear full of plastic or simply a completely or partially clogged nozzle. 

Related articles, possible solutions:

Under Extrusion

Cold Pull, clearing a clogged nozzle

Filter for cleaning and lubricating filaments for 3D printers