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My Ultimaker 2+ grinds a filament!

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Hello dear friends.

I really need in your help.

My Ultimaker 2+ permanently grinds a filament!

I've tried already many things to solve this problem: I played with feeder tension, with retraction settings with temperature settings. Nothing.

I would be very grateful if you could advise me anything.

Thank you in advance.


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There must be a reason why the filament cannot pushed forward or not as it should. So check your TFM coupler if it is ok or not, this is probably the reason. Or your Bowden tube is old and needs to be replaced. Or a completely clogged nozzle, but then you would have more problems.


Test your TFM coupler if you can push a filament manually trough the tube. Unscrew the nozzle or take out the bowden on the print head and try if you can move a piece of filament in the head without much friction.

Edited by Smithy

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Thank you very much, Smithy! Now try to do all these things. Truth be told, the printer prints from time to time without problems. Could this dragging be somehow related to the print settings (retraction settings), or problem with improper heating of the extruder? 

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Retraction yes and no ? Of course a lot of retractions an the same spot of filament will grid the filament, but unless you print an object with a lot of retractions, I don't think so. The default retractions settings in Cura of normally ok. (There is a setting to say, how many retractions should be done max. on the filament, to avoid a grinding)


Improper heating of the extruder can also be a problem, but I assumed you heated the nozzle the temp you need for your material. But yes, if the nozzle is not hot enough, the filament cannot pushed through the nozzle and the feeder grinds the material.


But check the coupler first, here are some instructions to change, but you see what I mean.

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