Lamp shade holder

My desk lamp broke - the little thing that holds the shade was the responsible. I designed and printed a exact replica of the part to fix it.

The shade was cylindrical, about 56.7mm in diameter, and the space to fit the part into the lamp body was about 12 mm. The part attaches both to the shade and the body with 3 bolts and nuts (2 to attach the shade, 1 to attach the part to the body)