This is a soldering aid meant to replace a breadboard when soldering header pins onto a PCB. I've added STL files that will work for a Raspberry Pi Pico, but the OpenSCAD file can be modified to work for any PCB or as a generic soldering aid for putting header pins on any board.
More about this project: https://rasterweb.net/raster/2023/03/27/solder-board/
The author marked this model as their own original creation.