I’ve been looking for the perfect pill box for my wife’s many medications (7 pills in the morning and 6 in the evening). I tried 4 others from here and none of them were exactly what I needed. Yesterday I printed your model and it is exactly what I wanted. I do have a quick question. what do you recommend to attach the lids? For now, I cut paper clips. the problem with them is that they tend to fall out if I tip the container. I need something that fits tight (will slide in but not fall out).