Kitchen Paper Holder - Customizable

Here is a simple yet effective kitchen paper holder.
Designed by me in OpenSCAD.
The design can be printed without supports in any material and color of your choice.

The bar in this example is made of a simple 15mm tube, but basically any diameter tube can be used.
Standard kitchen paper is 23cm wide. I have cut the tube at 30 cm to leave some extra space.
Since kitchen paper is not heavy, a single screw is sufficient to keep the holder attached to your wall. However, to avoid twitching,