MV-18650 - Minimum Viable 18650 holder

This is a very thin (flimsy?) 18650 holder - all the walls are only 1mm thick. I designed this for inclusion inside a project box via either a CAD merge/join operation, or simply by gluing it into an enclosure

Note that it is designed for the smaller 9 x 14.5mm AA/AAA battery springs, instead of the larger and stronger springs recommended for 18650 batteries. Because it centers the smaller spring pads vertically for these larger batteries, if the tabs are oriented out the bottom of the case (