I modeled these laptop risers taking inspiration from the folding phone stand. They are only 4mm thick when folded and approximately 30mm tall when unfolded adjustable on 2 levels (but pretty close to each other). 

I used 3M double sided tape to stick them to the laptop but depending on the surface you can use glue or other types of double sided tape.

They can be printed without support or brim, but if your prints have elephants foot I suggest using a raft because of the tight tolerances. 

Only needs 2.55 meters of filament