this is a mount to make a futaba style trainer port plug for powering things such as FPV monitors and WIFI boosters. 2 prongs from a PCB rail will fit diagonally with a bit of straitening. the 2 middles pins are + and - (google the pinout to verify) but the top middle pin in - and the bottom middle pin is switched + (when the controller is on) best printed at 50mm/s and at arouns 0.1mm layer height NOTE this is not polarity "dummy" proof. The notch on the outter of the rail part should be lined up with where the notch should go... -just mark it and make sure you plug it in right.. the notch made the print alot more difficult to get a good clean finished product..