Based on the Ikea Bergshult (120cm x 30cm) shelf. The models are exactly 30cm & 20cm wide depending on what shelf you got. Because they go on the sides of the shelf I suggest printing 3 of those if you are going to load the shelf heavily.
Each stand requires 2 or 4 screws for wood + washers. You don't need anything else other than a screwdriver to screw them in place.
Because a lot of printers do not print 30cm wide models, I've included the 30cm version in two parts, you just glue them together and they are ready to be screwed into place. (It's the one in the photos)
Infill 30 is good enough, however for peace of mind you can print @50-80.
Supports may be needed depending on your printer's overhang performance for the screw holes.
monitorStand_20cm.stl | 227.5KB | |
monitorStand_30cm_OnePart.stl | 258.1KB | |
monitorStand_30cm_TwoPart.stl | 297.9KB |