This is a Notched Nut Socket Driver for Switch Nuts like the ones used on RC Transmitters. The new DX series of RC Transmitters has a problem with the Switch Nuts loosening off because of a lack of rotation locking for the switches. This item will let you hold the switch top when snugging up the nut.
iPRINT 3D, HATCHBOX, Tianse, etc. PLA, PVC, PETG
Blue or whatever works
I used PLA for most prints with an extruder temp at 210ºC, bed temp at 45ºC, and fan at 32% after the bottom layers are printed.