Quote Originally Posted by djprinter View Post
I suggest printing a test model with different tolerances and see what works, each printer is unique.

You could also error on the tight side and as long as you use thick enough walls you can file it down to a prefect fit after--more work, but reliable results.
Damn why didn't I think of any of that ;-)
Oh wait I did :-)

Anyway here's the test print files page: http://www.thingiverse.com/thing:533472
The negative space tolearance test is the one you want: http://www.thingiverse.com/download:872739