WTF is wrong with my extruder??
One day, OK, next day, this. Noticed extruding was looking erratic. Did a cold pull, and another, both fine. Set screw on hob gear is tight. Bed is level. Belts are tight. Black PLA filament is dry. Did a first-layer cal that was all over the place. Then did a one-layer thick strip 260 mm long, 30 mm wide, rotated 45 deg. Picture shows what I got: Alternating, hard-edged, open and shut bars (80 each) approximately 3.25 mm wide, and a 50 bar length bookended with a 3-bar wide (9.75 mm) closed section.
Can someone with higher math skills than me figure out where this cyclic hiccup is coming from and how to correct it? Thanks.
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RE: WTF is wrong with my extruder??
Reading some other posts about extruder issues, some seem to lean toward extruder motor problems, but during the most recent extruder/hot-end tear-down/cleaning/adjusting (there have been several), turning the extruder motor by hand seemed absolutely normal, no binding, step backforce normal and consistent. If the motor was skipping steps, I would expect to see a gradient on the extrusion, but the hard edge on the stripes and consistent dimensions seem to mitigate against random step skips. A loose wire would likewise not explain such a consistency as far as my mechanical analysis takes me. Not at the machine as I write this so will have to post the F/W version later, but issues with that too seems to me to be a long shot.
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RE: WTF is wrong with my extruder??
Possible important detail: with elevated Z axis, heated nozzle, moving E axis with control knob yields VERY inconsistent results. Descending "stream" is not consistent in width or speed and stops altogether after about 10 seconds, no matter how many "steps" I dial in. This is through a wide range of idler spring tensions from very light to very heavy.
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RE: WTF is wrong with my extruder??
Possible important detail: with elevated Z axis, heated nozzle, moving E axis with control knob yields VERY inconsistent results. Descending "stream" is not consistent in width or speed and stops altogether after about 10 seconds, no matter how many "steps" I dial in. This is through a wide range of idler spring tensions from very light to very heavy.
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RE: WTF is wrong with my extruder??
Starting to think upgrading to MK4S might be easier that trying to fix this. Thoughts?
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