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Since retractions above 4 mm can cause jams due to plastic sticking to the cold half of the metal print head, what's the best way to avoid jams when swapping filaments?

Cool down and yank out, rapid pull out while melted, pull out at partial heat but not completely melted, or something else?

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  • $\begingroup$ The best solution is to prevent that the filament clogs the hotend, this means that it may never "mushroom" in the throat too high up that only heating for a prolonged time (and e.g. disabling the cold end fan) for heat to reach that part to melt it would unclog your hotend. Pulling out while hot looks as the most promising solution, if the filament deforms and cools, it is very hard to get out (from experience). $\endgroup$ – 0scar Aug 29 '19 at 7:02
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Cold/Luke-Warm pulling can cause damage and wear to the hot end, and should only be used in cases where you suspect there's a jam in the nozzle.

Pulling the filament out at a few degrees above its normal printing temperature and pulling quickly is what I use, and what I've seen other's also say, and the procedure most machines use.

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