Quote Originally Posted by Elizabeth Greene View Post
I asked another designer today and he suggested I change the slicer to print exterior perimeters before the interior perimeters. Supposedly this reduces the tendency of imperfect interiors to squish the exteriors out of tolerance. I'll give it a try and see what happens.
I have not found that to work. Why - well there is always a little squish involved in printing. And - you have the other things which just stack up.

I have made a few of these:
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which have holes of different sizes that I can test the screws with. This was one that I did for PLASTITE screws (from McMaster - torx plastic screws) and I was trying to figure out the best hole for #4, #6, and #8 screws.

Also, I have made screw holes be hexagonal rather than circular - thought it might help. But - also, I can print hexagons on their side as well, does not violate overhang angles.