1) print on blue tape cleaned with isopropyl alcohol. This is by far most important.
2) Try not to print solid upper layers, or add holes in your cad part or whatever it takes so the upper layers aren't pulling so hard on the sides of your print (as the plastic cools it shrinks and pulls very hard)
3) Do not put sharp corners on your parts where they meet the print bed. Either round the corners, or add a 1 layer thick skirt. Some have said you can use the skirt option with 0mm distance. Haven't tried it.
4) If you print with ABS 1,2,3 isn't enough and you have to get a heated bed. With PLA a heated bed is waste of time.
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illuminarti 18
See my post here, earlier today:
http://umforum.ultimaker.com/index.php?/topic/1944-just-assembled-great-machine-try-to-improve/?p=13613
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