Khóa xoay cho đầu cắm barrel 7909

The Bluetti AC180 solar generator utilizes a 7909 barrel connection for the input from solar panels. These plugs become loose over time and result in burned and melted connections both on the cable and the Bluetti unit itself. 

This twist lock device has two components: a female part that is glued to the AC180, and a male part that is glued to the plug. 

Printed in Sunlu PETG high speed at 255/80 temps from a filament dryer. .16 resolution with 3 walls. 15% infill gyroid. Test fit the pieces and sand where needed to twist smoothly. Make sure supports are used for the male components. I suggest .3 top and bottom gap and 30% base coverage.

There are four sizes of male connectors measured in mm: 13.5, 14, 14.5, 15. These seem to fit the variations in plug sizes. Pair the appropriate sized male disc with the female disk. Lock together by twisting CCW. The pieces may only twist a little at first but will get smoother over time. Place the plug through the assembled piece and plug into the receptacle. Push collar down till the bottom is flush with the AC180 surface. Once everything fits ok remove the assembly and place a very thin ribbon of glue around the rim of the female disc. Be careful NOT TO get glue on other pieces. Inset the plug assembly back into the port making sure the female side is firmly glued. I let this setup for 30 minutes be gluing the male side to the plug.