Gaps/overlap in part fit up

[Orion Pobursky]

Sometimes due to the nature of plastic parts, when a real life model is translated into a computer model there may be some discrepencies in part fit up. This is especially true of Technic models where the complicated angles can lead to shortfalls/excesses of 4-5 ldu. While I'm willing to live with a difference of fractions of an ldu up to 1-2 ldu, when I hit the 4-5 range I become dissatisfied. I'm just curious how other authors deal with gaps or overlap in parts when building models.