Shower door towel rack

Does what it says on the tin. This fits the bar for this holder https://www.amazon.com/gp/product/B07WCDFP26/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 I cut the tube to length with a Husky aluminum tube cutter. 

To print left and right, mirror the holder. You'll probably have to adjust some dimensions to fit your door or tube so I included the F3D file.