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ckrusor

Extrusion ceases after three minutes on UM2

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I've had a UM2 for several months, and I have been very successful in my past troubleshooting adventures. With a lot of research and trial and error I learned how to get excellent prints from the standard materials and I even finally got decent results with Delrin (from Gizmo Dorks). Then, about a month ago, the machine started having a problem. It prints well for the first five layers or so (less than ten minutes), then material stops coming out. It happens across the appropriate temperature range for all nine of the materials I have successfully used before. It lays down the first few layers, then extrusion slows down progressively, eventually depositing material intermittently, then the head just continues to follow the path without producing any material.

I have tried nozzles in three materials (brass, carbon steel, and stainless steel) and four sizes, I have tried tinkering with the speed, temperature, and material flow settings, and nothing makes any difference. I turn the temperature up to max and set material flow to 950% and still nothing comes out. And the motorized feed gear on the back is not turning and chewing up an unmoving filament. If I change materials, the old filament just has the expected toothmarks, not an excavated furrow from a frustrated feed gear.

Any ideas? Please let me know if I can provide any more information that might help. Thanks very much.

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