Here is the model I created for Steel sheets.
It holds two sheets, on either side of the table.
I have included individual .STL files for all parts, .3MF files for combined middle and right/left holders that go on the legs of the table and .GCODE files ready to print.
.GCODE use 9% infill and concentric type, 2 perimeters, 3 bottom layers, and 4 top layers, set for printing in PETG.
A printer can be sped up to 200% without any issue.
The author hasn't provided the model origin yet.