Quick Moi3D Tip (Swipe to see each step): In certain cases Moi cannot produce a fillet of a larger radius. If instead of a "Calculation Failed" message you'll get a patch of a new surface you can actually use it to produce a desired fillet through a Boolean operation. Ideally the software should be able to recognize such situations and still create a fillet (like some other CAD applications do). In the meantime though you can use this workaround trick to still get the needed fillet. Also note: if boolean operation fails when doing this(happens on more complex objects), try extending the patch along the fillet edge axis by using 1D scale tool until it stretches beyond extends of the object.
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