About this 3D model
A simple divider I made for the AI2 First Aid Kit linked below The divider will need to be unioned with the bottom of the case in either blender or your slicer if it is supported. I set the z height of the base of the divider a mm or so into the bottom of the case. The cases have .4mm walls, it's best to have your slicer set to arachne, and enable thin walls. https://cults3d.com/en/3d-model/various/ai-2-first-aid-kit