Just print the laserstand part 1 file two times, one time mirrored.
Then either use the laser cut dxf files or create your own. The material thickness should be 3mm. You can also use the dxf files to create 3d printable stand parts, though in the video I've used a laser cutter to show widths not usually possible with a 3d printer.
I've created this model for this video about creating 3d printing and laser engraving (video language is german).
The author marked this model as their own original creation.