Clarification : V2 is for the ACE series. V3 is for the AT series. (Ace series is a little smaller.)
6/26/18 : Updated a second version, added here. The second version helps the metal detector lay the coil against the wall by using an angle at the top. I find that v1 was beginning to puncture the foam piece in the handle - decided I'd try to conform to the natural angle of the detector better.
Needed a way to store my metal detector out of the way in the closet - this is what I came up with. A hanger which fits. It'll require you to remove the wired headphone hook on the bottom of the clip, if you have one. (My max did.)
Print it at 30%-40% : you want it to support the weight of your detector. I used .3mm nozzle and PLA at 210c.