I modeled this from scratch, but inspired by listed two designs, also made the front-lip taller to hold my 15 inch dell precision workstation. 

The plate size is 230 x 200mm, depth 7mm, the lip height (from the plate surface) is around 20mm, but you can change it in onshape. 

V1 version doesn't have any angle or stopper on top of the front-lip, some laptops might slip down, if you have any spare foam seal like me, that helps.

The Onshape model is here, it's a parametric model, if you don't want the front-lip cutout, set the variable #lip_cutout to 0.01. Free free to remix it. 

Update

• 2024-10-19: added a front-lip cutout to avoid the slip (V2)

Assemble and Print tips

You will need some M5 screws and nuts. 

I printed it with eSun ABS+

• 0.6mm nozzle
• 0.3mm layer height
• 3 perimeters 
• 20% Gyroid infill (trust me, that's more than enough)

Upload your makes! I enjoy seeing them!