This is a mount for the BigTreeTech SFS 2.0 sensor for RatRig printers. It was specifically made for the VCore 4. It uses 2 M6 x 12 screws and 2 drop in t-nuts to attach to one of the frame rails of the printer. It has enough clearance for the belts of the printer to pass behind it.
The author marked this model as their own original creation.