GregValiant 1,110
Holes create a special problem. The nozzle drags the plastic in a circle and the plastic wants to cut corners so it pulls towards the center making an ID smaller You don't notice it as much on an OD because usually there is an inner wall to act as a dam to keep the plastic outboard. How much it pulls to the middle is affected by a lot of things. The phenomenon is known as the Gr5 Snot Factor after it's discoverer who had a runny nose at the time.
The Shell | Hole Horizontal Expansion setting can be used to enlarge a hole. Not all holes are round, it acts on any vertical holes in the part. Horizontal features don't suffer from the snot factor. In Nicko-Airbus example, the ID is .5mm too small. A Horizontal Hole Expansion of +.25 would get the ID at least into the ballpark of being correct. The hole horizontal expansion number works on the radius. The downside is that the smaller holes will probably need a different HHE number to be correct.
Edited by GregValiant-
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CQAdam 0
I am having same issue, would love to hear from the community about this...
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