New i3V owner: A few beginner questions

[printbus]

But what you see from the bottom of the knob isn't directly supporting the top layers. The knob design fills in the layers at about 10mm high, and then adds low density infill for a ways before adding on the top layers. It still could be that the upper structure doesn't recover from the bridging issue - I'm just pointing out that there's more to the knob structure than you're thinking.

Was the extruder height recalibrated when you went from printing on glass to printing on tape? How do your two knob heights compare? I noticed that with the three knobs I printed previously, the one sliced in 0.9.9 came out about 0.3mm shorter.

I'm not sure what magic pixie dust did the trick, but the knob I just printed in new MakerFarm black PLA, with print cooling fan, cold bed with painters tape, 10mm/Sec retraction and sliced in Cura is at an entirely different level of quality than any of the three test prints I did before.