Simple arc style notebook stand. You can easily change width and length of the stand. Default size is 22mm width and 170mm length for my Dell XPS 13. Works fine even for my Macbook Pro 15 (late 2013).
For the top part you need supports. Today I have had hard time to configure correct tree supports in Meshmixer, so I've fallen back to PrusaSlicer supports. You can find it preconfigured in 3mf files.
I recommend to use smaller layer height at the top of the arc. 3mf files have it preconfigured.
To ensure that notebook won't be scratched by the stand, I've used self-adhesive protectors on the bottom and top part of the stand.
If you need different width or length, edit the model in Fusion360. Change the parameters in Tools > Modify > Change Parameters dialog.