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I have an extrusion problem with my creality CR 10 3D printer while printing. I am using a standard 0.4 mm nozzle with a 1.75 mm diameter PLA and I use Cura as my slicer.

This printer worked perfectly fine and I stopped using it a few months ago right after the problem started.

When I try printing a .gcode file, the first layer is very thin but visible (it seems like the glass bed is engraved). However, after the first layer is complete, the extruder stops working properly. It moves forward then jumps backwards so it looks like the filament isn’t moving (I can also see the extruder’s marks on the filament). Also, the axis seem to move fine in all directions as I’m able to see a clear first layer.

However, when I go into the “prepare” menu of my printer and move the extruder, it works great as the filament flow is very smooth.

Hence, the problem is only visible while printing. I don’t think there’s a problem with the .gcode files as I printed them perfectly fine beforehand.

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  • $\begingroup$ It looks like your nozzle is clogged. You need to perform a “cold plug“ (google it). $\endgroup$ – Adam S. May 9 '20 at 14:56
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Clearly you're having an extrusion problem. Extrusion problems usually come either from a clogged nozzle (as @Adam S. said) or from the extruder it self. To determine where the problem is located I would first do a flow rate test using this. When doing this test you can determine if the extruder is grinding the filament or if it's not grabbing it too much. After the calibration of the flowrate you can be certain that the printer is (by .gcode) pushing the correct amount of filament. If the problem persist I would first do an unclogging (since it's cheaper than the following option) using something like this.

If both previous options do not solve the problem, I would highly recommend you to by a mk-8 like metal extruder. After a while, the plastic one that comes with the printer loses force and you'll lose steps. Personally, I had a similar problem where the first layer was printed in a droplet pattern and was solved by changing the extruder to a metal one.

Try these options and if the problem persist you could upload some pictures of the first layer or a video. Other possibilities I think of are that the filament is having trouble passing through the Bowden tube or maybe you'll have to reasemble the hotend.

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