Needed to reduce the foot print on my desk of my Thinkpad and raise the monitor up while working from home.

This also gave me a reason to try and learn fusion 360

The brace isn't particularly needed but it does prevent the legs coming apart, and can be attached to any cross section. I recommend a touching brim on the brace as it is a thin part

Legs print with 4 walls and a low infill (15%) and a 0.3 or 0.4mm layer height and pla and it should be strong enough, mine hasn't collapsed in a week of use.

Rotate the print to be horizontal and print flat, sorry about this, i have since found that there is a setting for this in fusion :-/