I’ve used RoundCorner and FredoCorner successfully until I’ve encountered this modeling problem. I am trying to draw a sofa leg and on the inside I need to bevel edges (blue color in the image) and merge them into one but none of the plugins allow me to do that. I would be very grateful for any suggestion.
Draw half of the leg and make it a component. Radius the inside edge with RoundCorner or FredoCorner. On the right in the screen shot below, you can see this component also has the radius on the outside corners as well.
Copy, flip and rotate the component to make the other half.
Miter the components–you only need to edit one for this. Draw a line at 45° on the top and push the triangular face down to the foot of the leg.
Hide the seam line edges with the Eraser tool while holding Shift.