A Licensplate holder - fits standard german License plates.
Multiple mounting options on the car side, fits snug, i had to put some PTFE spray in it as lube to get it to twist, but depends on your tolerances of course.
The holes are meant for M3 Allen head screws.
There is the option to put grub screw from the back to fix the licensplate in place, also a space to fit a Ziptie that tucks nicely into the holder, so black Ziptie in black print is basically invisible, added it just in case.
i made it so at car meets i can take off the license plate and will be making accessories to clip in the twistlocks that stay on the bumper.
Print in ASA or ABS for outside use, i printed it on its side for maximum stability and so nothing can snap off because of layer orientation. means it would need a little support but nothing dramatic.