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coffeecup

Weak extruder of UM2

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I am helping a friend to troubleshoot his UM2. It seems that the problem is caused by the weak extruder. I own a UM1 and the extruder of UM1 is much stronger.

One example: when a new print job is started, very often we need to push the filament into the extruder in order to let the plastic come out from the nozzle. This never happens in UM1.

We tried tighten the spring of the extruder, disassembled the extruder and cleaned the internals. It still does not work. I wonder anything I can do or adjust to make the extruder a bit stronger. Thanks.

 

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