Summary

As small as possible case for ebay / aliexpress unbranded hex RC screwdriver set. I recommend printing it upstanding, so the hinges and the locking clasp will not be brittle. Only the hinges and the clasp needs support. The hinge hole has 2mm diameter, so it accepts a small piece of 1.75mm filament as a shaft. (Drill it out if you cannot fit a filament inside.) The case also has four holes angled in 25 degrees, to put the screwdrivers upstanding for quick reach, while you are using them. The case accepts screwdrivers up to 19mm diameter handle, and 180mm total length.

--- UPDATE ---
I had an idea to update the original model with built in supports for the hinges, and also add a lock what makes the case easier to open. I got mixed results. :)

V1: The original case. You need supports for the hinges, and also for the clamping part. Opening is a bit tricky: you need to use your nails (or something) to pry open the two halves.

V2: I made a moving locking part (with a printed built in spring) and also a button to push away the lock.
Button A: Original slim design, you need to push it really deep to open the case.
Button B: Updated version with more grip on the pushing surface. But it protrudes more from the surface.
No supports needed, but you need to print it standing, like the V1. The holes are designed larger than the diameter of the filament, so it compensates the hole shrinking effect. You still need a 2mm drill to clear the holes which are accessible. The down-facing holes are behind a 0.2mm support layer (to make them printable without support) you need to cut / drill them open. Please check the images carefully, and compare yours to it to find the hidden holes! (They are at front of the visible holes.)

V2 design is also a bit tricky to open, because if you press the button too hard, it jumps out from your hands, because of it's soap shape, and it is a bit slippery too. Anyway the V2 is much cooler! 8)