If you converted your trailer from a 7-pin to a 13-pin plug, you might have encountered the problem, that the new plug is bigger and therefor doesn't fit in the holder anymore.
With this print you can adapt the hole to an endcap, so you always have a place to put the plug without having it hanging on the ground.
For this you need two parts: The Adapter and the Screw.
Because access is limited the screw has a slot for a flat head screwdriver and the adapter has a hole so you can srew it in from the front.
The Endcap can be screwed on with three M3 screws. You will need so drill a drainage hole in the middle of the endcap.
Printing:
The threaded sections should be printed in 0.1mm Layer hight, the rest can be printed in 0.25mm.
The Adapter should be placed with the circular face on the printbed, as the threads need to be printed upright. Therefore you need supports for this part.
The author hasn't provided the model origin yet.