Universal yoke mount for use in general aviation airplanes. I use it to clip a checklist or a chart to my yoke.
For spings use the springs of 2 washing pegs.
Use a 5mm oring to fit around various diameter tubes. I cut mine (under an angle to get a larger cross sectional area) to length and glued it with quick hardening superglue together which is strong enough. The oring will remain secure to one part of the print so you don't lose it.
For printing print the two clip halves standing on their side gives me the best results. Glue the feet using superglue
Broadly used at the moment at the best dutch flying school: MATC