It's a reupload from my Thingiverse account since their site lost some of my designs, I'm moving to MyMiniFactory.

Simple, economical, easy to print laptop stand. (24 grams with my PLA at %20 infill, less than a dollar in material)

Supports up to 16mm thick laptops for laptop version.

Tinkercard link for publicly available design

Including the smaller version which I'm using to stand my keyboards, kindle etc. Unfortunately design file is lost for small version but you could probably % resize the laptop version.

Small version can also hold phones vertically (your mileage will vary), could be useful if you are taking a video call while working and keyboard is not on it.

0.28 layer height with 0.4mm nozzle and %20 infill is fine for my use cases, it's rigid and strong enough.

It also features holes where you could screw M3 or smaller screws if you want to fasten the base to a shelf incase shelf table etc has free play. (Like my IKEA mesh shelves.)