This is a door handle fastener for the 90's and 2000's models of Mazda Protege, Protege5, Familia, 323; and should also fit the Millenia, MPV, and a few other various Mazda models.
I recommend printing these in something other than PLA (such as ABS, ASA, etc.), although I've found PLA still holds up quite well.
The author marked this model as their own original creation.