This design is intended to hold shotgun shells. This makes a box for 12 gauge shells. The width of box (w) can be changed for either 3.5 inch magnum shells (97mm), or 2.75 inch shells (78mm). The box can also be changed into any dimension needed. The 3mm walls will stay that thickness. This box's dimensions can be changed into anything that is needed, the lid will automatically adjust.
*** made updates for the lid so it doesn't need shaved to fit. Print with supports**