The double-row, double-entry magazine battery case is designed to hold 8 AAA batteries, with redundant space that should allow for an additional 1-2 batteries. All parts of the battery case are made using 3D printing, without the need for any metal parts. The sheet spring is printed in solid PETG. In actual testing, it can be printed with a single layer of the outer circle of the 0.6 nozzle, but the edges need to be trimmed. During assembly, the internal structure is as shown in the picture. After inserting the ejector plate and spring, the baff