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195 Questions View all

How to remove filament tube?

The filament tube was press to fit. How do I get it back off? The filament snapped at the feeding motor and there is nothing to grab onto.

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And simply unscrewing it was not the answer

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Was able to snag the tiny bit of exposed filament with an xacto knife, heated the extruder, and was able to pull out the filament from the bowden tube. Phew! I was just about to try feeding more filament, pushing against the broken piece. It was that or disassemble to remove the entire tube.

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We still need instructions on how to remove the entire tube to get at broken filament. That, or the "okay" to just feed new filament thru pushing out the broken pieces.

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As mentioned above I was just able to snag the tiny exposed bit of filament with an xacto knife, heat up the extruder, and pull all the filament out.

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TL;DR - it's probably easier, and quite acceptable, to start the heater and push the broken segment of filament forward through the nozzle.

You can remove the Bowden tube by pressing DOWN on the circular ring at the top of the fitting. Keep pressing down with one hand, and then pull UP on the Bowden tube.

Vincent, I am curious about the circumstances that caused the filament to break. Were you perhaps trying to pull filament out of the tube with the extruder heater turned off? It's my understanding that the tip of the filament widens out during the heating process. If you turn off the heat with filament still loaded, that flared section freezes tightly in there. (My other printing experience is with a Makerbot, and during the "Unload filament" process, it explicitly waits for the nozzle to come up to temperature before it starts drawing the filament out.)

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I'd started a print after the machine being off all night. The first break happened pretty immediately at the feeding motor. Reversing the direction caused the second filament break right at the Bowden tube. Sounds like gummed up, or in sufficiently hot print head could have caused this.

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Lesson learned - manually heat up the print head and run 6" of filament thru before starting a print job.

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One last thing - I don't think there's a Guide for this yet, but I can tell you that there is another one of those fittings at the far end of the Bowden tube, buried inside the extruder canister. If you are determined to go looking inside, I -STRONGLY- advise you to use a marker to make some reference marks on the canister and red acrylic disks. As this photo shows, the Bowden tube must (a) pass through the canister in a straight line, (b) be lined up with one of the setscrews at the bottom end, and (c) pass between two holes at the top end. Simply put, given the six screw holes at the top of the canister and four at the bottom, there are two "correct" ways and four "incorrect" ways to line things up.

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To remove the tube you need to take a pair of pliers and squeeze the fitting on the bowden tube while you gently pull on the tube, it comes out of the fitting that way. However, if you have plastic lodged in the bowden tube you make have to push it through manually or remove both ends of the tube.

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What is wrong with just adding filament and push it through while printing?

If you have trouble (un)loading the filament, try this:

http://www.thingiverse.com/thing:1382828

Still thinking on a way to remove the Bowden tube easier, since pliers damage the device more than nessesary. Maybe a disk that fits around the tube that makes it easy to press down on the clamp without using pliers.

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I have a broken filament in the tube as well. This was probably due to the fact that the Bowden tube got crushed between the frame and carrier when homing. I know looking how to prevent it from happening again as the Bowden tube crinckles during printing.

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Vincent Button will be eternally grateful.
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