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Never experienced other problems with overhangs?

If you have a Replicator2 I recommend this alternative cooling fan duct; http://www.thingiverse.com/thing:140254http://www.thingiverse.com/thi...

You could also try a 5 degrees lower temperature, and/or 10mm/sec higher speed.

Downward Blower Duct for Replicator 2