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35 The first steps
LOADING THE FILAMENT (continued)
Changing or removing the current filament already fed into your CraftBot’s
extruder
If you intend to change the color or filament type first of all take warning
that forcefully pulling it from a cold extruder could potentially damage vital
components. To remove the filament correctly, the extruder must be heated.
Once the filament has cooled it will leave a thicker section of previously melted
material in the extruder itself, creating a certain “knot” that acts as an anchor
when trying to retrieve it cold. It simply won’t fit back out of the passage way. To
remove correctly, revert back to your LCD menu options and find the “extrude”
icon and touch it. You must heat the extruder in the same fashion as you did in
loading it. Once the extruder reaches the target temperature of your filament
(keeping in mind that diffreent materials such PLA, ABS, and PET have different
temperature characteristics), you can now press the “extrude” button, but only
briefly, and then touch the “reverse” button and hold a short while. Once the
gears have begun to retract the filament you will be free to pull it out from the
printer and then load a new filament.
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