April 3, 2014 at 3:51 pm #21688
In addition to Windell’s comment,
Try to wiggle the egg by hand– if it is not firmly locked in place, then you may see this kind of behavior
it helps to also rotate the egg around several times as you are trying to wiggle it. You may have it placed firmly between the couplers, but if the egg’s axis is not coincident with the eggbots rotational axis, then the egg will very quickly precess as it is turned. That precession causes it to begin to slip or otherwise not rotate as expected and you then can get distorted circles which are even incomplete.
In my work flow, I do my best to get the egg’s axis well aligned when I initially load it, but then I hand spin it several full revolutions while trying to wiggle it about. That usually causes some slight shifting but the end result is a well seated and well aligned egg.