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clog nozzle(is that even possible with the new print core?)

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New to 3d printing and definitely new to Ultimaker, UM3 being my first Ultimaker. I think my AA print core nozzle is clog because little to no plastic is extruding when I try to print. Is there a video on unclog it or advice on how to unclog it? The nozzle getting clog result in some mid print failures :), until it totally stop extruding any plastic.

I also read that the tension on the feeder can lead to a clog nozzle, how do you know if you have too much tension or too little? I see little tread marks on my filament they aren't deep but noticeable. How do you adjust the tension on the feeder?

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@avluis,  My nozzle on the outside is always clean, for whatever reason it is clog on the inside. Thanks for the link! I'll give it a try once I find some time(busy with a project for a client).

@Zwakie, how do you adjust the tension on the feeder? Mines seem to be okay, it's alot less grinding than the one in this photo:  https://d3v5bfco3dani2.cloudfront.net/photo/image/0x0/57ffa429dfe28/04%20PLA%20met%20tangetje%20vasthouden%20en%20in%20printkop%20duwen_3.jpg

@ultairjan, yes I did the first time I insert the 2 filaments that came with the printer, though the tension was too much it won't even go up the feeder.

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