PETG/ABS/ASA/PC or I guess PLA but its not designed for that type of plastic an might be too delicate and too much friction.

4x M3 x 8mm or M3 x 10mm socket head screws

6x M3 x 6mm socket head screws

6x screws that can go into the bottom of your desk and not poke out the top, minimum thread length of 10mm, recommend 12+

1 ton of plastic

1 ton of patience

1 good head on your shoulders to figure out how to do the supports :)