Separate the bosses from the wall to maintain a uniform wall. The receiving hole diameter of a boss should be equal to the self-tapping scew pitch diameter. The boss outside diameter should be equal to twice the major diameter of the insert. Walls MUST have draft. A minumum of at least 1 degree of draft for every inch of wall.
Any draft angle is better than no draft angle.
Texture requires 1.5 degrees of draft for 0.001-inch texture depth. If the nominal wall must varie, the change should be gradual if possible and should not exceed 15 percent of the wall. The radius of an inside corner of a part should be 50 percent of the nominal wall thickness. The radius of an outside corner of a part should be 150 percent of the nominal wall thickness. Radii can be as large as the design will allow.