Note, there's a lot of geometry problems with the "iPod Tripod Mount 3.stl" file. Lots of faces that are almost co-planar but not quite. This is especially true between the base and where the arms start. This makes for a print that is very weak at those junctions, as the printer is essentially printing multiple parts, just really close to each other.
I tried uploading this to http://cloud.netfabb.comcloud.netfabb.com to get it fixed, and it reduced its shell count from 23 to 2, which is close to what it should be (which is 1).