Modular Battery Holder D cell 4 count

Remixed from https://www.thingiverse.com/thing:954557 and https://www.thingiverse.com/thing:1463646

Holds 4 D cell batteries and is compatible with the other items in this series. The four holes aren't arranged mathematically perfect, but they work and you can't really tell unless you look closely. Maybe I'll revisit this someday when my CAD skills improve... :)