Metric Bit Holder

I found myself needing metric bits for work on my 3D printer and it's not easy to come by metric drill bits in my area so I ended up ordering some off Amazon. They came in a plastic bag so thought I make a holder to keep them organized. I only added .05mm to the original print and I ended up having to drill out the holes with some standard bits to get workable tolerances. I found those bits to generally be anywhere from .10mm to .30mm larger than their metric equivalents so I re-sized the bit ho