I designed a Desk mount for my Rode AI-1 Interface. It screws into the Desk with 4xM3 Screws and clips the Interface tight with snap fit clamps.

It is advised that the Mount is printed flat, so the clamps won't crack that easily. 

I think you have to scale the width around 4mm extra.

Supports are needed. 

Infill - 15%

Wall amount - 4