I had a friend buy a few different styles of bit holder and he didn't find what he liked. I found this one by jippeenator, but the middle slot wasn't usable because there wasn't any room to flex when pushing in a bit. I added space between all the slots, and opened the entry width about 1mm more for easier snap-in/out function. The screw is the one that comes with the Dewalt - I think M3x10 or 12. Photos is of my own which works great. 

Made with PETG - and all I had was purple.