I downloaded this http://www.thingiverse.com/thing:489323 and saw there were some issues with the drawing. Things didn't line up perfectly, so I redre...w it. The old version has some errors that are autofixed (you can see them on the thing view of the original STL) in slic3r. My version should not have any errors when importing into your slicing software. http://westrealm.com/category/3d-printing/
3d model print parameters
For best results:
Print with a thin outer shell. This will prevent gaps on the top layer details. Notice my orange vs other colors.
.8mm
Print at 1...00% infill for a strong part. This will likely be put under stress in your pocket, so you want it to be strong.
For multiple colors use the cura pause at height plugin.
4.1mm and 3.1mm. Make sure to enable retraction ~5 mm