Undershelf mobile stand with configurable view angle

An under the shelf mobile stand with configurable view angle
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I was looking for a basic mobile stand which can be fixed under the shelf with an adjustable viewing angle based on seating position.

I have designed basic stand after multiple iterations, it has sliding stopper which allows user to tilt mobile left and right, top and bottom independently.

** Use sample.stl to print smaller section of stand for checking the sliding mechanism**

I am noob in designs and openscad, please excuse me for the crude design.

Note: Could not find a solution for variable infill for the bottom corners, so added extra shape. This can be removed/edited in scad file, so this can be attached to wall.

TODO: Make top portion of stopper circular so the adjustment angle and grip is smooth.