A very simple but effective and stable book stand or folder stand.
I use it to put sheet music in a Leitz folder on top of the piano.
But of course it can work as well with other hard covers with a thickness of about 3mm.
The OpenSCAD design may be adapted to your needs and is available as pedestalA() in
https://github.com/Github6am/am_parts3D/blob/master/clamps.scad
The stands are designed such, that the center of gravity shall be at the center of the baseline for maximum steadiness.
Print two instances, one mirrored.
clamps_pedestalA.stl | 58.9KB |