Just a couple simple connector rods, was going to glue them in but they were snug enough of a fit I didn't bother. tried to make them blend in with the regular model and not botch it up too much. Hope it saved you a few minutes.
Version 2 includes minor changes to solve the issue of connector rods not fitting if using a different infill percentage. Print without bottom and top layer and Hex infill if you wish to have the same open look.
The author remixed this model.
Only changes from original was to add a couple connecting rods. The file i added to was https://www.printables.com/model/255402-update-vertical-laptop-stand-take-3/comments/1408899