This is a basic spacer for the Raspberry Pi Pico. I'm using it by gluing the spacer to another part, which leaves the Pico still easy to remove. It is meant to be used on the top face of the Pico, and it's the same thickness as the Micro USB port, so it should add no thickness to your project.
The author marked this model as their own original creation. Imported from Thingiverse.