Designed as vertical stand for holding a MacBook Pro. Pictured is my 17" 2011 unibody MBP. Plenty of clearance for ventilation and the 2011 MagSafe cable. The slot is 26mm wide.
I am the original designer of the Elegant Arch. I've moved the design over here. On Thingiverse are a number of remixes for newer laptops. However it's easy enough to just scale the model to fit any laptop.
https://www.thingiverse.com/thing:265529
The author marked this model as their own original creation.