hole dia not matching the .stl file info (1 reply)

I'm having a little trouble with hole dia not matching the .stl file info on the print. Could I be missing a setting someplace?
Before I printed this part I printed out a 100 millimeter Square pattern , the dimensions were dead on.
The file was modified in solidworks and netfabb for proper dimensions prior to printing. the Dia is supposed to be just under 22 mm, but it is printing at 20.

. mm