This mount is for Tarmac SL7 seat post, allowing you to mount a Garmin Varia rear radar light.
For this mount you will need a Garmin puck with threaded inserts.And following fastener2 x M3x5mm1 x M4x16mm
Update V2:A new version is now available, the V2 has been optimized for FDM printing, you can print it without supports.
I suggest printing this in nylon fiber with carbon or something similar.
Use 0.2mm layer height with at least 50% infill