I printed the original hook without considering my desk setup and found that it would not fit my desk. I have a drawer in the way of the hook's opening on the left side of my desk where I needed to place the hook.  I also have a much thinner desktop than the original was designed for which prevented the thumbscrew from making good contact.

After sharing comments with Twogz on the original post, I found that the original design's Fusion 360 files were also shared.  

I took some time to learn a bit about Fusion 360 and reversed the design into a lefthanded hook that opens on the right side.  I also created several sized thumbscrews to get one just the right size for my desk.

All credit for this work should go to Twogz for a fantastic parametric design… I just changed a few numbers from the original f3d file and sent it to the printer.

The cover photo is the hook with the left hand opening fitted with the 29mm thumbscrew.  I've also included a picture of the original design with its 14mm thumbscrew, a comparison picture showing the two designs, and a picture of the various sized thumbscrews in 14mm, 19mm, 24mm, 29mm, and 34mm.

If you need the righthanded hook that opens towards the left side, check out the original https://www.printables.com/model/148073-sideways-headphone-hook