Joergen's suspicions were correct, I believe. The root cause of my printer's inability to feed filament satisfactorily was due to a defective position of the Delrin rubbing block against the filament. After comparing mechanical drive dimensions between our machines, we found that Joergen's typical rubbing block operating position is about 0.5 mm less tight than my block was in its fully retracted position. Photos follow.
Zoom into this photo and inspect the diamonds on the right edge of the drive bolt image. Notice that only the top six diamonds are fully pointed, cut deeply, and "good." Widening the slot on my lathe enabled me to position only good knurling in the filament channel. This mod was motivated by Joergen's older drive bolt, which has much more aggressive knurling than these new drive bolts. I'm sure this mod is good for optimizing the drive capability of the new bolt, but it didn't solve my problem:
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calinb 11
Send me a PM immediately, hcpi. If you are in the U.S., I can drop my extra PEEK in a USPS priority box for cheap and get you up and running by Monday!
Or maybe you'd like a break from all this "Ultifun" for a while. I was an obsession for me for over a week. My wife says I look like hell! (Lack of sleep). I'm actually too old for all-nighters, I think.
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