A friend wanted some clips for his car so I agreed to try making them. He said they worked. I printed the 1st one with supports but because the clip is so thin it was difficult to remove the supports from the print so I printed again without supports. A little drooping in a couple of places but didn't stop them from working.
Best to orientate them so they stand on one edge. I used 0.1mm layer height to make sure I got the finer details. I also used ABS because it's stronger and flexes better than PLA.