Tapered objects get tabs at the perimeter of the "shadow" not the bottom layer

[howardjones]

I have some tapering square bins where the top is larger than the bottom. The Automatic Add feature seems to look for the bounding box of the whole object, not the first layer, so two of the tabs are quite far from the actual footprint of the object.

[5axes]

This is normal, as the code uses the function provided by Cura, which is the so-called convexhull geometry (the shadow seen on the plate). As the surface of the supporting geometry is not available and can be very complex, this compromise was chosen to position the tabs. The function is only an aid, not an exact solution.