With the end of the knee protection
Make a primitive Cylinder 8 segments
Apply a rotation of 1/16 of turn i.e. 22.5° to the y axis
Adjust the form with non-uniform scale to preserve symmetry.
With the 3DSnap activated at MidPoint, insert vertecies as in top on the right.
Adjust the new vertexes like above (Move on axis Z and non-uniform Scale on axis X for User).
With the 3DSnap activated at MidPoint, insert vertexes as in top on the left.
Use Chamfer Edge to duplicate the edge.
Adjust the round-off.
Extrude and Bevel the polygon.
Repeat the operation once more.
Adjust the vertexes to obtain this form.
Extrude and Bevel twice like above.
For face adjust the vertexes to obtain this form.
Make the edges visible in red and Chamfer Vertex to still insert a polygon and to finish the round-off.
Make an instance copy of the model and place it in the correct possition on the knee of the body model
Continue to model the original object and the copy will be updated in real time.
Reduce the thickness of the dimensions and extrude the polygon twice to obtain the result above.
Move the vertexes to obtain these dimensions and check the result on the copy in position.
Lastly, on the back part of the object, extrude and Bevel to form a hollow.
Finish by applying Make Planar to this polygon.
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