Pogo pins connector
Pogo pins are used in electronics to manually connect to holes in printed circuits without the need to solder. They are used, among others, when flashing boards.
I needed a connector so that they are evenly spaced.
This version is for a 2.25 mm pitch (Sonoff devices, for instance, but probably others as well)
The pogo pin has a nominal 1.3 mm radius, but this was too small of a hole with my printer. The holes in the connector allow for a semi-tight connection (you can slide them easily and add a drop of glue if they fit)