Hi Kevin,
> Very handy tip, I always thought it was between 1 and 1000.
That's generally close enough that it should be fine. There isn't any exact cutoff point, it's just that if your objects are too large in relation to the fitting tolerance the results can be too heavy and take too long to calculate (because they're trying to reach some very tight accuracy level in relation to your object), and if your object size is too small and approaches too closely to the fitting tolerance then fitted geometry is not accurate enough.
Usually it is worse for your object to be too small in relation to the tolerance though.
But the reason why I'm generally moving to a relative tolerance system that is based on some fraction of the object size is so that you won't have to worry about this as much.
- Michael
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