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under extrusion with new feeder

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I recently printed this feeder and attached it to my ultimaker 2


Ever since, my printer has been under extruding.

I've tried loosening and tightening the tension on the feeder and i've tried cleaning out the print head a dozen times and all i've managed to accomplish is getting a hotend covered in burnt ABS which needs to be scraped off.

I don't know if the tension is too loose or tight and i can't seem to get the atomic method of clearing the printer to work with abs properly so i've resorted to using a paper clip to try and scrape the inside and push the junk out.



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Tension needs to be high enough so that the knurled wheel bites into the plastic, which should leave nice precise series of toothmarks. The plastic should not be squeezed so hard that it deforms to an ellipse shape, as the feeder will then be losing a lot of torque just getting the filament through the narrow gap in feeder.

The whole feeder chain is actually quite a simple mechanism. If you check for binding at every step along the way, e.g. possible binding on the spool, excessive tension in the feeder, excessive friction in the tube (tightly wound filament), dirty nozzle etc, it should be possible to pinpoint where the problems are.

Also consider a temperature test and that the filament is good quality of the correct diameter.


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