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svbreakaway

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  1. I recently upgraded my UM2 Extended to 2+ using the kit. And immediately started seeing under extrusion. This is my first 3D printer and I don't know if what I did is at all right, but what seems to have worked for me was carefully and BY HAND twisting an 1/8" drill bit up into the opening from the nozzle end (after removing the nozzle and Bowden tube). The drill bit diameter at the tip is 3.18 mm. I turned the bit into the opening a little at a time by hand, then pulled it out carefully each time (sometimes by hand, sometimes needing pliers to pull it out). I did that about half a dozen times. There seemed to be quite a bit less resistance when I tried pushing filament through the heated nozzle by hand (with the Bowden tube removed) vs before. I also put some Canola oil on the first couple feet of the filament before I inserted it into the feeder. It seems to have made a world of a difference (although I can't say now which had the greater benefit - reaming out the PTFE bushing with the drill bit or the use of Canola oil on the filament). So far, I think my prints are coming out better than ever. Again, I don't know if there are any deleterious effects from doing this but so far I'm happy with the results.
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