thin object

Hello, ive wanting to print this M
when trying to slice it useing slic3r, it estimates 20mins printing time, and uses 1608 mm thread
how ever theres nothing to see at the 3d viewer. and my printer cant print it.

using makerware and printing on my makerbot works fine, how ever i'd like to print it with my printrbot

the walls are 2 'threads' thin, and i assume thats what causes the problem. are there any setting that i can do that makes me slice it?
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