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You know Slic3r has a feature called 'brim' that works wonders to combat warping. If you don't use slic3r, this openscad file generates one on STL files - http://www.thingiverse.com/thing:16728http://www.thingiverse.com/thi...

I find brims to work much nicer than rafts, and the cleanup post-printing is much easier

openSCAD print anchors
by pogden