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Skipping / Under extrusion

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For some time, my printer skips every now and then while printing. Is this normal? I've been trying my best on cleaning the nozzle with Atomic method after I switch filaments. Should I sink my nozzle to acetone? Here is a picture while printing with silver Ultimaker PLA. Tried to raise my nozzle temp from 210°C (default PLA profile) to 220. Helped a bit but still happening every once in a while. With ABS (picture with black print) I've been having sort of under extrusion I believe? Any suggestions what to do?





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