Hi,
Imagine you are designing a Mortice and Tenon joint.
You create the profile(s) of the Tenon and Join-Extrude. Then, you use the same profile(s) to cut extrude the corresponding Mortice. The trouble is, in practice, this mortice would be too small to use. You then have to go around and expand the Mortices surfaces by a clearance amount eg 0.002"
So my suggestion is, when Extruding, to have the option to Offset the resulting surface by a user defined amount. The implementation could be via a checkbox then drop down prompting for a value. If the extrusion was a Cut then this value would make the hole bigger.
Thanks in advance
Matt