This is the simplest yet most effective design I've created yet. I took inspiration from daGHIZmo's supports, while adding a hole to lock the two pieces together for ease of storage and transportation.

The model included works great for my pc (Clevo P650SG), but I also uploaded the .scad script with several parameters for you to customize it.

You also choose the symbol you prefer engraved on the side.

WARNING

Be careful not to close your lid while using this! You might damage your laptop if you forget the support is in the way and push too hard over the edge of the screen.
I got used to suspending it by pressing the power button, but if you want to keep using the lid this design is not for you.