I needed something to fix an ikea ivar rack to the wall at a certain distance (3cm) to make space for a switch. I wanted to try something with freecad, so I made this first attempt in freecad (usually I use openscad)

The final parts were printed in brown, not blue. I was a bit worried about getting the holes correctly aligned with the hole in the model, but that turned out ok. I used 4 parts for one ivar unit (2 per pole)