Partly jammed extruder

[gigagrain 0]

I am having problems with my new ultimaker. The extruder keeps getting jammed.

It is VERY hard to push the filament thru the head. It is possible, just very hard.

I have had about two hours successful print, but also 3 extruder jams. The first time I am not sure how I solved it. The second time I took the head apart and warmed it.

The third time, I took it apart, warmed it, but I did not solve the problem!

I have read the Jamming wiki: http://wiki.ultimaker.com/Jamming

But it does not realy tell how to clean the head? Or why it get's jammed.

This is how the print looks when the head is partly jammed:

Does anyone know why it gets jammed? Or how to clean it?

Thanks

 

[gr5 2,173]

I have never had a jam. Maybe you are getting a) dust or b) wood chips in the print head? Dust can come on the filament or from a dusty room. Some people clean the PLA before it goes into the feeder. Regarding (b), release the clamp on the feeder for pla. Remove the pla and look carefully inside - is your wood getting chewed up? That can create wood dust which jams the nozzle.

I have never had to do this but the first step would be to heat the print head to around 200C, then carefully and gently unscrew the nozzle. Preferably with your fingers and oven gloves. Once removed you can burn out most pieces of wood and dust with a flame such as a propane torch or gas stove. Don't melt the brass nozzle.