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Just one quick question about the filament.

Can I leave the filament in the extruder for a prolonged period of time while the printer is off?

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  • $\begingroup$ Keep in mind that merely removing the feed line doesn't clear out the nozzle. But that's a matter of cleaning or reheating ahead of next print, not preserving the reel of filament itself. $\endgroup$ Jun 12 '18 at 14:29
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Most filaments you can leave in the extruder indefinitely without any ill effects.

There are some filaments that need to be stored away from moisture, particularly Nylon, because they absorb moisture from the air and don't print well if they contain a lot of absorbed moisture. However, this isn't an inherent issue with having the filaments in the extruder (if you had some setup that protected the filament from moisture while in the extruder, that would be fine as well - but in most cases it is more practical to store such filament in an airtight box).

Most commodity filaments (ABS/PLA/PETG) don't suffer from this as much (PLA supposedly also absorbs moisture but I haven't noticed this to be a problem, perhaps it depends on the conditions of the room in which your printer is kept) so they're fine to leave in the extruder.

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  • $\begingroup$ What about the wood filaments? Same moisture considerations? $\endgroup$
    – dale
    Jun 11 '18 at 18:53
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    $\begingroup$ Most specialty filaments (wood, metal, etc...) are basically just PLA. $\endgroup$ Jun 11 '18 at 19:14
  • $\begingroup$ PVA should also be stored in an airtight container. $\endgroup$
    – 0scar
    Jun 11 '18 at 22:13
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If you "planing" to leave the filament there for months, then it would be a good idea to store it away, but for most filaments it is not a big deal to be stay loaded... provided that the humidity is not high (e.g. a shower or kitchen next to it would be not so good).

My experiences with "moistured" filament is that they get brittle, but only breaks when I don't print something. And it is a pain in the a** to get out the last part of the filament that broke right at the entrance... so store it away is always a good idea, if you are not too lazy ;)

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  • $\begingroup$ A pain in the neck, because you try to see where is the rest of the broken filament. $\endgroup$ Jun 15 '18 at 22:42

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