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A brim doesn't work as well as the "mouse ears" trick for large models - just search for it on google - or use this one and put it in every corner of your model: http://www.thingiverse.com/thing:839635
I'm making mouse ears for myself - the height should always be the height of your first layer, so you can cut it as easy as a brim.

Works every time with any type of filament for me.

Add Mouse Ears to anything in your Slicer