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If you need extra priming, you can increase the number of skirt outlines on
the Expert tab in Cura. You can also use control knob in Anet3D printer to extrude
plastic before printing.
1.2 The distance between nozzle and bed is too close
If the nozzle is too close to the bed, there will not be enough room for plastic
to come out of the extruder. The hole in the top of the nozzle is essentially blocked
so that no plastic can come out. An easy way to recognize this issue is if the print
does not extrude plastic for the first layer or two, but begins to extrude normally
around the 3rd or 4th layers. To solve this problem, you can adjust the four screws
at the corners of the hot bed, turn the screws clockwise and the hot bed will move
down. Turn a little once to increase the distance until there is enough space for
plastic extrusion (The distance is about the thickness of a piece of A4 Paper ).
1.3 The filament stripped against the drive gear
Anet3D printers use a small gear to push the filament back and forth. The teeth
on this gear bite into the filament and allow it to accurately control the position of the
filament. However, if you notice lots of plastic shavings or it looks like there is a
section missing from your filament, then it’s possible that the drive gear has removed
too much plastic. Once this happens, the drive gear won’t have anything left to grab
onto when it tries to move the filament back and forth. Please see the
Grinding
Filament
section for instructions on how to fix this issue.