The Screw: In your slicer scale the X and Y at 99%, keep the Z at 100%. Might be different depending on your material & printer.
To fix the main and the suspended parts, use M4 10mm screws and nuts. 2 of each.
Glue the "strap" part with super glue.
We print the Tactile Spiral Vase Pen Cup a while ago.
https://www.printables.com/model/198024-tactile-spiral-vase-pen-cup
But we soon needed a way to have it right at hand at our Ikea Mittback angled desk.
Note, the design is to be a nice fit for our table at home which is angled at roughly 33 degrees. The horizontal arms are not adjustable.
The author marked this model as their own original creation.