Shutdown procedure for bowden hotend

Hi all,

I've been searching everywhere but can't find the information I'm after.

Basically I need to know how to remove the roll of PLA from my machine after I've finished printing. I'm concerned that if I just pull the filament out while the head is still hot, that it might wipe molten plastic through the bowden tube. And if I do it cold then it probably won't come out. Also I want to put the roll away after I'm done, as the humidity is quite high here and I don't want the roll to absorb too much moisture before I put it back into a ziplock bag (with dessicant).

As you might be able to tell, I haven't actually melted any plastic yet (although I've done all the calibration needed for my Kossel mini).


Can anyone tell me what the correct way to do this is?


Thanks in advance

Heat it up, and pull it out, works everytime. (E3DV6)

Build a dry-box to keep the filament in: [www.pinterest.com]

For PLA, heat the head to 120C, then retract it. That's more reliable than retracting it at full operating temperature,

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Thanks for the ideas, it helps immensely