What is meant by “circle size” for an extrusion, and how do I determine what circle size my shape requires?
The circumscribing circle size is defined as the smallest diameter circle that will completely enclose the entire cross-section of the extruded shape. When determining circle size, the profile should be treated as a triangle. The length of the hypotenuse is the determining factor. For example, if the shape is a rectangular tube, allow one face to be the base of your triangle. Draw the hypotenuse of the triangle from one corner of the base to the opposite corner of the opposite face of the tube. Whatever dimension is achieved should always be rounded up to the nearest whole number.
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