6" Trim Ring for 4" Junction Box

I bought 4 of these to cover incandescent ceramic bulb fixtures in my garage which I had replaced with single gang outlets for new brighter lighting. The results were perfect and I am very pleased with the product.

Was not aware that the ring was 3D printed. I intended on using it as a decora ring for a light that did not fully cover the rim of the back box. This will not work and I would like to return it.