Continuous vertical lines on shell
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Do you think you could post a few photos of the printer, particularly the XY arrangement, and maybe a video of it in action? I'm a visual person, so it helps me to see what's going on in motion. Perhaps something will become apparent.
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I was thinking if bad quality pulleys, for example misaligned center of the hole can create effect like this.
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@diamondback It would be interesting to see the stepper motor current waveform to see if there is some distortion at higher speed. Back EMF does normally have an effect but I am not familiar with these drivers as I haven't attached motors to my DUET yet.
What supply voltage are you using?
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I had fought this problem on my CoreXY and in my case it was misaligned X Y linear rod bearings which created vibration (it's a custom contraption that I overtightened by mistake so it didn't run smooth). Plus, the motors were resonating and the vibration of the axis added to the resonance. I ended up going for 0.9deg motors and smoother rods and now it's 99% gone.
On the topic of belt tension, I observed that no matter how tight you make them, the plastic parts on the axes (and possibly the belt) will give in until equilibrium is reached. Yeah, it might seem a bit tighter at first, but try checking again in a year.
