Question
The machine is running but there is no plastic coming out of the nozzle. The printer is making a ticking noise.
Answer
There is something preventing the filament from being extruded. Sometimes when there´s a partial blockage, the printer can still push the filament thru all but sometimes the blockage is to severe ane the extruder motor skipps steps hence the ticking sound. Try find out where there´s a blockage and clean it. Also when that´s done, check the drive gear so that it´s clean and get´s a good grip on the filament.
Related articles, possible solutions:
Cold Pull, clearing a clogged nozzle
Filter for cleaning and lubricating filaments for 3D printers