Due to coronavirus I've had to unexpectedly move out, landing in a studio without a desk!
Therefore I've modeled these parts for an 'improv desk' using the lower level of the salon table (12mm) in my studio to be suspended between my bedframe (18mm diam) and a shelf (16mm) in my closet.
I'd recomment to print 'plank_houder_final' with higher infill and shell thickness than one usually would to make these parts HEAVY DUTY, seeing as these parts - 'left' in particular! - will hold the table's weight and the occasional rested elbow in quite an unfavorable manner.
Similar things can be said about 'stang_houder_piled', though it won't need to be as heavy duty due to it resting on top of a rod rather than hanging off a shelf for dear life!
I expect the parts 'stang_houder' 70-76cm to hold up well with regular to light infill and shell thickness
The author hasn't provided the model origin yet.