45mm/s is a max speed that I use for perimeters, I tend to go slower, I use 30 as a starting point before cranking it up. You might be just on the edge given how it mostly works except for a few spots lower on the cylinder. The rest, I don’t know, it might be inconsistent material diameter.
@Jeff_DeMaagd check the link below for my timlapse of a Benchy printed at 80mm/s 
https://plus.google.com/+AdamSteinmark/posts/JjqifNQPxkT
“PLA” PETG is a different animal.
@Jeff_DeMaagd My apologies. I’ll try some speed tests with PETG. I’m reprinting the original model now while waiting to hear back from Interservo.
Hello
I reprinted the model last night and the rings are gone
Pics please!
https://drive.google.com/open?id=0B3Gmh2I0ddcAZDV3enZuakRVSkU
I still need to play with retraction because I’m getting gaps on the perimeters of bottom layers and blobs on upper layers which seem like mutually exclusive problems…
Nice!