Sometimes you just need an extra screwdriver, and if you are like me you have hundreds of small hex drivers around that never seem to wear out.
This is a small and simple handle just big enough to make those bits useful, but not big enough to take up a bunch of space in your drawer or pocket.
The handles hex slot is designed slightly undersized for molding the bit into the handle while the plastic is still warm and pliable. To do this just press the hex bit into the handle immediately after the print ends, and roll the opening between your fingers while it is cooling.
With this method, you will get a snug and secure fit. I've found that my copies hold onto the bit well during use, but are still easy to change.
If you are printing multiple handles, or you don't want to mold your handle, you may need to scale this up by 2-5% (depending on snugness desired)
For a more permanent solution, only scale up to 1-3%, let the handle cool, and hammer your bit in.
Print and enjoy!