I saw a similar design here - but it was an STL file and specifically made for a certain size of power brick. I needed a different one - so I made this parametric OpenSCAD model that you can customize according to your needs.

You can freely modify all dimensions - length, widht, height as well as the two cutouts (width, heigth and offset from the back side) AND freely place the mounting holes. Just enter the dimensions you need in OpenSCAD. Play around with the offsets to understand how they work … if you set them to zero, the cutouts will be placed in the center.

For a 65 W Lenovo laptop power brick and some tiny SPAX screws, I use the following dimensions:

// size of body thickness = 2.0; length = 112; width = 32; depth = 32; // cable entry on left cl_width = 10; cl_depth = 12; cl_offset = 0; // cable entry on right cr_width = 20; cr_depth = 22; cr_offset = 0; // fastening screw_dia = 3.2; screw_chamfer = 1.2; screw_fromtop = 10; screw_fromside = 18; driver_dia = 8;

Filament used in the photo is some ESun low-temperature woodfill filament I bought second-hand for cheap … boy, that stuff warps!