Originally designed by Impulse Ungineering for a different set of drivers.
https://www.printables.com/model/892777-yet-another-driver-case/files 
I redid the sizes for this set, which has slightly different sizes.
https://www.amazon.com/RCpow-Hex-Driver-Screwdriver-Multi-Axis/dp/B0DN1KX4WR
I will admit, I don't know why they have a 1.3 and 1.27mm option; they both measured the same on my calipers. so I don't nessesarally reccomend this set.