By far the easiest way to deal with this would be to just print them slightly oversized, add some abrasive paste, and then 'run in' a set using some balanced pa

By far the easiest way to deal with this would be to just print them slightly oversized, add some abrasive paste, and then 'run in' a set using some balanced pattern of movement, tightening the clearance as the parts wear in until they're sufficiently smooth.