Here are some great tutorials on how to polish your 3d printed model with acetone vapor. Some results are just awesome! Stay safe.
More info and pictures :
http://blog.reprap.org/2013/02/vapor-treating-abs-rp-parts.html
http://www.trenchphysics.com/?p=41
The process is pretty simple. Get a large glass jar, put it on a heated build plate, add a tablespoon of acetone, and crank the heat up to 110C. Acetone vapor will form in the jar and react with any printed part smoothing out those layers.
More info and pictures :
http://blog.reprap.org/2013/02/vapor-treating-abs-rp-parts.html
http://www.trenchphysics.com/?p=41
