Since my first and very own screwdriver with bits-kit I've owned, I've always found myself in the situation that the bits were constantly going their way to valhalla. Like, where do they end up? Maybe they're working fulltime at some shady diner. Don't care, won't care.
But since I always ended up losing those little ****s, I've always bought new kits instead of individual bits - since those were always more expensive than a whole new set with the handle included.
And this is the part of the story where I came to design this thing. I hated searching through all the boxes and holders from the sets to ultimately not finding the bit I've searched for after all. I've hated not having everything in the same place. I've hated having to transport like 2 boxes for two bits. That was just plain stupid and I hated it.
And thus I present you the semi-modular bit holder for 4mm bits! *victory fanfare*
Each piece you print of this thing is designed to fit another piece, on each of its four sides - much like a puzzle piece, but... snappier. This way you can 'click away' the bits you need and let the rest be in your workshop or room or kitchen or caravan or... don't look at me like that, I'm just not judging.
Still not clear what I mean? Look at the pictures above, doofus. It's self-explanatory.
P.S.: This is final. If you want a regular-sized version, scale it up. Maybe it works, maybe it won't, can't say for sure.