NefroBox: Small box for storing/holding screws or small things

I have had a lot of boxes to keep screws or small things together when I am working on a Project. None of them are helpful to pick up things with your fingers. This design allows me to use easily my fingers to take the screws. Being spheroidal the small objects are grouped and don't get trapped in the corners. I designed it with a separator in case I want to use it. Also is included a top (optional) for transport. The name NefroBox comes from its resemblance to a pair of kidneys. So if you have a spare pair of small kidneys you can also hold them here... Up and down parts have a ledge to help opening the box. Tolerances have been taken into account, so you don't have to file it too much to a perfect fit (so be careful when scaling). Freecad sources included. Maybe an improvement could be done adding a magnet at the bottom of the box... Or maybe printing the top with a translucent or flexible material... Or even adding a thread/lock... Or even adding it a side hole to support a screwdriver tip... Or add some led/button battery...