FLEXI-TRAX CAR Lightning McQueen, battery cover.

Have about 6 cars but no battery cover for any of them.
My kids want to change batteris for them self and brake the cover every time :(

So with a 3D printer ( On its whay ) and a good Teacher https://www.thingiverse.com/spjutbjorn/about we did this STL so I do not have to buy new cars just because there is no battery cover ...