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It is best to clean the nozzle's outside after every print, so that no black residu builds up. I usually do this immediately as soon as the print finishes: just wipe it with a paper cloth, when still hot. But you can do it later too, after warming up the nozzle a bit.
Wiping the nozzle with silicon oil prior to starting a print also reduces build-up of residu for some materials (PLA), but less with others (PET), in my experience.
Reducing temperature and making sure you have no overextrusion may also help.
I second the cleaning the nozzles after every print in the highest order. Both nozzles for me because the other nozzle may pick up stuff. Also, some of the AA core type materials are hydroscopic and will sizzle and crackle like PVA. So, I just hit them each time a print is finished.
In addition to what I said about the temp. drop, keep in mind that the idea is to drop it low enough to reduce the carbon build-up, but still allow flow. Different material manufacturers have different qualities.
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We are happy to announce the next evolution in the UltiMaker 3D printer lineup: the UltiMaker Factor 4 industrial-grade 3D printer, designed to take manufacturing to new levels of efficiency and reliability. Factor 4 is an end-to-end 3D printing solution for light industrial applications
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kmanstudios 1,120
I second the cleaning the nozzles after every print in the highest order. Both nozzles for me because the other nozzle may pick up stuff. Also, some of the AA core type materials are hydroscopic and will sizzle and crackle like PVA. So, I just hit them each time a print is finished.
In addition to what I said about the temp. drop, keep in mind that the idea is to drop it low enough to reduce the carbon build-up, but still allow flow. Different material manufacturers have different qualities.
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