Order of walls = outer/inner

Make sure to configure outer walls to be printed first in your slicer. Otherwise it may be a tad too tight. 

Source: https://cad.onshape.com/documents/1d5a63fd1a4d4ec0f78d153c/w/8fa34c127f2aa4274baa7cf0/e/9915ddccabf8142efafa2a09