Mercedes Command 17mm Cell Phone Ball Mount

I had trouble mounting a cell phone holder in a Mercedes ML350 / GLE350 (W166, 2012-2019).  This attaches to the Command stereo in virtually every Mercedes during that decade.  Photos are on a 2018 GLE350, but any other Mercedes I've seen in that era will fit this with adhesive just above the cell phone buttons on the Command DVD / CD area.

Then, you can find your favorite cell phone holder and attach it here.  17mm is pretty much the standard size ball mount for all auto accessories.  I made mine out of PETG because I've had issues with PLA accessories in the past, melting and deforming in a hot car.