Ghosting = Ringing
Same thing - different words. Ringing is indeed fixed by reducing acceleration. It's amazing how little it slows down a print. Note also that if you change this and power cycle the machine it probably will lose your setting. I'm not sure how to save the acceleration value on the UM2 - there might be a save option in there.
Regarding the overhang/notch issue:
Typically this is fixed best with the fan. Were both fans on the UM2 at 100%? Many people got UM2's with the fans not working - takes seconds to fix as the connectors simply pulled out - let us know if this is the problem. Also Cura now has a new way to turn the fans on very gradually on the UM2. It sounds like you didn't use the latest Cura though.
How to check all 3 fans real quick on UM2:
1) Turn on the UM2. Before even the lights come on the 3rd rear fan should come on. Make sure it does.
2) Select "PRINT", choose a print from the sd card, then quickly go to TUNE menu. As long as you stay in TUNE menu it will not print and you can just hit the power switch when you are done with fans because as soon as you leave the tune menu it is likely to start printing.
3) In TUNE menu set fans to 100%. Make sure both side fans spin. make sure both blow and not suck. If you set speed to 0% and gradually increase they should come on for sure by 30%. Probably closer to 15 or 25%. Once spinning they will continue to spin even down to around 10%.
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illuminarti 18
Hi Happy! (Or do you prefer 'Robot'?) :-)
I've also noticed a little more ringing on some prints, and also a tendency to get vertical banding that appears to be related to belt tooth pitch. It shows up more on certain shapes and plastics: it was quite visible, for instance, in the side panels on a Tardis that my daughter printed last weekend:
I suspect that lowering the acceleration from it's default of 5000 to a lower value like 3000 (which was the default on original UM's - at least until quite recently), or even 1500, might make the effect less noticeable. I'll do some tests - you might try lowering the acceleration (via Maintenance -> Advanced -> Motion on the UM2 controller) and repeating your tests.
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