XT60 Auto Cap

A spring loaded cap that automatically closes when disconnected. Use the spring from a Pilot G2 gel pen. Use #0-80 x ¾" screws and nuts for the pivot. Use 2.5mm wide x 1mm thick zip ties to fasten. 

You may have to adjust the dimensions based on the insulation thickness around your connector. I normally upload step but because of an error when converting I was only able to save the base as stl.