I just wanted a simple double holder for my extra LP-E6NH Canon camera batteries so I decided to design my own. I wanted something more flat and wide as it is easier to slide in the outside pocket of my camera bag. The design is simple and minimalistic with a catch that holds the cells firmly in place. I designed the model to be printed in PETG as it is a little more flexible and durable for the retention clip. It would probably work just fine in PLA as well but the reliefs for the clip might need to be extended.