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Posted · Consistently clogging in the Bowden tube

I have a Creality CR-10 Mini, and I've had a constant problem of filament clogging in the Bowden tube. I've gotten through entire spools with no problem, but then sometimes it'll print for an hour when a clog occurs. The stepper gear will start slipping since it can't push any filament in, and if I try to manually push/pull the filament, it goes nowhere.

 

I've ran filament at various temperatures, I've used different brands of filament, I've used different Bowden tubes. I check the level of the bed before each print, and when I connect the Bowden tube, I keep the nozzle unscrewed about 1-2 turns, push it as far as I can, and then screw in the nozzle. I'm also very careful to square the tubing before putting it in. I've cleaned the stepper gear with a toothbrush and alcohol, too.

 

I don't know what the cause is, and I don't know what to do. I'm running on fumes trying to figure it out, and any help would be appreciated.

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    Posted · Consistently clogging in the Bowden tube
    15 hours ago, dadinfinitum said:

    ...and when I connect the Bowden tube, I keep the nozzle unscrewed about 1-2 turns, push it as far as I can, and then screw in the nozzle.

    I think that's too far.  Try 1/4 - 1/2 turn instead.  With 1-2mm of the Bowden tube sticking out and getting squished when you tighten the nozzle, the inside diameter of the bowden tube will get squished smaller.  Prints with a lot of long retractions will move soft material into that necked down area and cause a blockage.  Prints without a lot of retractions don't seem to notice near as much.

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    Posted · Consistently clogging in the Bowden tube
    43 minutes ago, GregValiant said:

    I think that's too far.  Try 1/4 - 1/2 turn instead.  With 1-2mm of the Bowden tube sticking out and getting squished when you tighten the nozzle, the inside diameter of the bowden tube will get squished smaller.  Prints with a lot of long retractions will move soft material into that necked down area and cause a blockage.  Prints without a lot of retractions don't seem to notice near as much.

     

    Thanks for the insight. I've also been told to check my fan settings. Here's hoping it works.

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    Posted · Consistently clogging in the Bowden tube

    The hot end fan runs 100% and continuously so there aren't any settings for that one.  The layer cooling blower is adjustable and if you have a beastly blower installed and it blows on the nozzle too much it can cause hot end problems.  The stock one shouldn't be causing issues.

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