I have already tried that method twice, with no succes.
I have then taken the assembly apart and cleaned everything:
- Replaced the grab screw for the fillament on the feeder
- Took the hot end apart and cleaned everything using small gas burner
One thing I did notice: When the hot end assembly was cold, the fillament did not go through the threaded bar easily..
When it was warm, it did go through it to reach the nozzle.
When everything was cleaned and assembled again, the first layer started off perfect again, but after reaching 50% of the first layer, the problem started again..
Below image of the last known problem I had.
As you can see, it starts off OK, but then stops extruding and starts extruding again later on in the part.
I was thinking it might be that the part is overfeeding which clogs up the nozzle and starts grinding the filament.
So some very basic questions..
- What is the best setting for the pressure on the fillament I am using (http://www.thingiverse.com/thing:26094, by Bertho), would you try to tighten up the spring as much as possible first, or loosen it?
It has been mid way up to now..
- Would you suggest a different approach to find out why the filament stops feeding in the nozzle?
- Could this have something to do with printing long strings on the base plate, which doesn't allow enough filament to go through the nozzle, so effectively the feed rate (or flow) of the feeder is larger than what comes out of the nozzle and it starts grinding the filament lightly, until the pressure is too high and the fillament stops feeding in?
I have read something about changing amps on the stepper motor to make it skip a rotation rather than grinding.
Can this be done with the original ultimaker as well?