This is a cufflink, with the Open Source Hardware logo on the primary side, and the Open Source Logo on the secondary side.
Next time you attend a fancy event, let others know you are a maker!
Print laying on main face, no supports needed, works fine with PLA 0.2mm layerheight.
To print using multiple colors, just add colorchanges in prusaslicer.
I printed on the mk3s without any problems in around 15 minutes.
The author hasn't provided the model origin yet.