Ultimaker 1, print speed 50 (default), shell thickness 0.8 (default afaik), I had tried various layer heights between 0.1 and 0.2 -- didn't make a difference to the problem.
The temp, though, did, I had always used 220, and repeating the print at 230 did the trick! I guess using a non-heated bed made at least the first lines put down stop flowing before a solid layer could form.
What hardware are you printing on, and at what temp, shell thickness, and layer height?
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