problems with circular shapes

I've got my printer working really well now. At least I can make good looking things. One problem I've noticed is that it can print straight lines perfectly but it gets a bit of vibration when making curved or circular shapes. I can see this in the final print as slightly jagged perimeters on the curved spots. Any ideas?

I have the exact same problem on a prusa here, I suspect it could be some acceleration related firmware setup (teacup on a Gen 7) but did not have time to try that yet.

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Most of my technical comments should be correct, but is THIS one ?
Anyway, as a rule of thumb, always double check what people write.

The problem is caused by accelerating and decellerating for every line segment rather than smoothly accelerating and decellerating only where necessary. You're using an old version of Sprinter, or some even older firmware. Solution: update to a newer Sprinter or use Marlin.