Pill box 4x7

I designed this pill box for someone who needs to take two different pills every day. She wanted to be able to travel without having to carry the medicine boxes, without having to extract those two pills every day, during a whole month.

This pill box features 4 rows of 7 cells. They can contain two or three small pills: each cell is an 8mm-sided square, 8mm deep.

Each row can be progressively uncovered with a slider so you can open a new cell on a new day, flip the box over your hand to drop the pills without any other pill falling. The sliders should slide but still stay in place when closed thanks to a bit of friction and bits and grooves.