Little, tiny drill bits are a pain! Unless your drill bit set comes with a case you are forever trying to dig-out those 'tiny bits' that are no bigger than a sewing pin.
So, this is my first attempt at an organizing case for those cheap set of drills that doesn't come with a case. No covers, just a tiny holes mostly in groups of 2 going from 1.2 mm to 3.1 mm diameter. This organizer is tiny = 10.2cm by 2.5 cm. This is NOT designed for any particular set of micro/nano sized drill bits, but I use it for my "Werkzeug Pin Vice" set. There are a variety of holes, so that it can work with anything you have bought or had on hand. The holes only go down to a diameter that most printers can print
The idea is to organise your bits in order of bore-width and height. The tiniest holes only go down a depth 5 mm, so you truly tiny bits do not get swallowed up even in this tiny case. [My set of bits : Werkzeug Pin Vice Hand Drill Bits (20PCS),(0.6 - 3.0mm)]
This is a small case and I think it helps to use the resolution your printer prints best. A clean, tight print at 0.25 mm is better than a sloppy print at 0.15.