Connector duplo with wooden railway

I made this connector for my kids, and I would not want to hold this back for other super-daddy's to print for their kids.

You are free to print this for your kids. By downloading you agree you will not charge anybody money for the 3D print of this design.

So, here is the link to the following 3D printable .stl file.

Make sure you cool amply during printing because of the overhang.