Thanks Owen for your reply !
It make sens that plastic shrinks when cooling ! But since I never read anything about that I though it wasn't so common !
I switched to marlin and netfabb a few days ago, and as you said the speed has certainly a role in that, because I never saw that happening when I used the basic firmware (which print at low speed)!
I would like to follow your advice, but at this time I don't know yet how to print some layer at a certain speed and the others at another one.
I have still a lot thing to learn !!!
Didier.
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It's fairly common. Warping caused by plastic shrinking as it cools. I found the other day that I got it much worse for a small part when I printed faster than normal so I guess it stands to reason if you printed slower for the first few layers at least you may not get so much warping.
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