How did you add the wall? I want to do the same thing but multiple dividers so that the pills don't rattle so much in my pocket.

How experienced you are with the bambu labs slicer or Orca slicer (which is what I use)? I don't use the mobile app, but here's a step-by-step on PC using Orca (which should be relatively similar to bambu labs, probably close to identical): #1 Once the pillbox .stl or .3mf is loaded onto a plate and in the slicer, you have to first add an object, a generic cube, that will eventually be resized to become the divider. As depicted, you can right-click it and you should see "add primitive" or "add object." #2 Select the "add cube" option. Now you have an 18 x 18 x 18 mm cube, so it would need to be resized to create the little wall. #3 In order to know how big to make the little wall, you want to take some measurements in the slicer. #4 As depicted, there's a tool to take measurements so you can know the width (turns out 19.5) and know the height (turns out 6.2). #5 If you have never used the measurement tool, wherever you click first is the light blue starting point, then you click again where the purple line will be, and shows the distance between those 2 points. So you can see I had the 2 inside walls selected to know the width of inside the box, and similar process to figure out to determine the height. #6 With the generic cube selected, you can click on the resize option, as depicted. Resize the cube appropriately, typically leaving some extra margin so that it overlaps into the walls rather than leaving a small gap or having to try to center it perfectly. #7 Once the cube is properly sized, and you can move into place. I wish you could "clone" an object that you've added, when you have to remake the generic cube each time to create separate dividers. #8 Because I'm paranoid about perfection, I went into TinkerCAD and created every possible size of capsules to make sure the capsule I use (a capsule of kratom powder, size 00) would actually fit. Once my mini slide pillbox had a divider, I scaled it up to a larger size.