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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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Mine has a heated bed and is an open design (a MagerGear M2)
My early ABS experimenting I thought the tip was clogging, but really it was the extruder pushing hard enough that it would machine away the filament, and no longer grip and feed.
If the problem is peeling/curling off the bed, then yeah, that's a "draft" problem.. or at least the base cooling off too much.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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