Printed without any supports. There was some stringing and sagging but nothing major. Cleaned it up in less than 5 minutes and it was good to go.

Holes are 3.2mm wide so M3 screw should go in without any problems. 

What's needed [optional]:

• 4 pcs: M3 x 12mm Flat head screws.
• 12 pcs [8 pcs]: M3 screw nuts (Can be either 12 pcs or [8 pcs], depends on wether you want the screen to extrude or not.
• [4pcs: washers]
• Screwdriver.