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ascanio

How do I clean this?

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I can't see your drop box link. Maybe you need to make it public or shared or something.

UM Original or UM2?

I'm going to guess the blockage is in your Bowden? If so then you should remove the tube at both ends but first mark which end is at the feeder because the ends are not quite identical - the end near the feeder has been drilled out a bit like a funnel.

Be very careful when removing the bowden as you can easily damage it. Make sure there is no pressure on the bowden before removing the clip at the head and pushing down on the ring while lifting. I've never removed the bowden from the feeder on either UM Original or UM2 so I don't know how to do that.

 

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Heat the nozzle up to printing temperature and then try to push a piece of PLA in there. If the white PLA that is in there is soft the new piece you feed in should melt into it. Then let the nozzle cool down to ~80-90C and pull on the piece of PLA you inserted. With any luck you should be able to pull out all of the PLA in one chunk or at least some of it so that you can repeat the process.

If the remaining piece doesn't become soft/hot enough I would first try to reach in there with tweezers and see if you can remove some of it that way. Failing that I would raise the temperature higher, maybe 240-250C, and try again.

 

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