I made this because I was tired of pulling my laptop off the table and having the hard drive hanging on for dear life. This thing is built thin because there isn't a lot of weight being thrown around but I've included the source files so you can tweak it to your specifications.

The main piece slides into the clip and the peg holds it into place. I did it this way so I could print the pieces flat. Generate some support for the loft or 'cradle'.