Slowdowns=blobs

[AndersE]

I have model of a hand where the printspeed drastically reduces speed at some points in the perimeters, thus making bulges that
is visible on the outside.

What is this? Bad model with too many small moves?

[Frguy]

look this topic, perhaps is it the same problem
viewtopic.php?f=9&t=3630

[JoeJ]

The cooling settings can slow down your printing speed. I would expect that would occur for small layers like maybe the last few fingers of your hand model. You can set the minimum cooling speed slowdown to limit how slow the print will go due to cooling.