Supportive infill optimized extender

I liked this design a lot but the default infill options are not well optimized to the way the part will be loaded when in use, so I constructed appropriate structures within the part to make aligned rectilinear infill ideal. This was made in Prusaslic3r, so please load the file with Prusaslic3r.
You should be able to get each one printed in about 6 hours with what I uploaded You can get down to 6 hours by reducing the infill percentage to 10%, which is sufficient for the application.