If the model is manifold (no holes in skin, no missing polygons, no polygons *inside* the model) and it has no unconnected polygons closer than .1mm apart and if all the normals are facing outward (STL files have polygons and each one has a normal to indicate which way is out and which way is in) then you don't want any of the "fix horrible" checkboxes checked.
Usually "type a" doesn't harm a manifold model but sometimes it fills in things that are meant to be hollow.
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nallath 1,117
Yes; Thats the reason why these options can be turned off. In some cases they fix horrible models, in some cases they wreck them.
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