This is a 30cm wall mount (siliconic glue) towel holder, it can move about 45° on the left and on the right,
inside the bar there is a 5,4x212mm hole, to fill with (in case) a steel round bar to increase strenght.

fixing and mounting are 2 caps with 3mm pitch thread, there are 2 threaded hole in the center part.

in case of smaller printer cut the bar with prusaslicer and insert some 4mm fixing with it, in case of printing in 2 pieces use of internal steel rod is highly suggested.

infill about 30%

i upload also che original freecad file in case you want to play with it