RC 1:10 wheel nut (7mm/m4) to 4mm bits tool

EDIT 7.march 2019: Changed 4mm side as it was too big to fit some tools.

This is an RC car wheel nut adapter to mini bits tools like the wowstick eletric screwdriver.
Its 4mm on the tool side, suits 7mm or m4 on the nut side.

It is printed as a two part to increase the strength of the smaller 4mm part. It should be printed laying down.

The weakest point of this model is now twisting between layers at the nut side, but so far it has worked fine for my RC use.

Joining the parts coul