Slot.It SCP Controller Holder

Minor changes to the original
- moved the top clip down a few mm to hold the controller more securely
- raised the plinth for the grip a little for the same reason

I also added a 3mf that puts two holders in the space of a shelf for the popular Harbor Freight tool box that people use as a slot car box. I use this box and three of these trays to carry six SCP controllers for oXigen, which include all three types, SCP1, SCP2, and SCP3, all of which fit this controller holder nicely. They are wireless and battery powered, so no need for the cable management features.