I feel this could be better.  Printed with 3DR,

3D Printing
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I feel this could be better. Printed with 3DR, 1.75 PLA at 190 C

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Are you using a fan? Not bad really, though.

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Storm trooper?

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Not sure what model you used, but it looks like you lost some fine detail. I’d check for loose belts and slop in your delta arms.

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Using 2 fans 1 40mm and 1 80 mm from different angles.

Storm Trooper from Star Wars to fit a presta valve for a bicycle.

I’m using spectra line and its tight as a gnats … I got new 6mm rods calibrated to 0 - .008mm variation but I’m still experiencing bearing slop. Not really ready to sink another $100 into new rods again.

6

I don’t believe 8micron variation would not be causing that very minor ribbing. Honestly 8 microns is probable well within the error of your measurement device. Our CMM at work only measures to the single digit microns. What do your calibration cubes/cylinders look like

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I’m not saying you can’t improve, but that model has some tough overhangs even at a small scale. Good luck though

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Slop in the joints can act as a low-pass filter on movement of the head, resulting in a loss of fine details.