1/4 inch drive Bit Holder
I use lot of different 1/4 drive bits for my power screwdriver. I've gone through lots of bit holderrs also. I wanted one with a tight fit and lots of holes and had a lanard loop. So I test ran a few hole sizes and found one I liked.
Print at 1 shell .2mm layer, 20% infll. If its to tight then put some sand paper on a 1/8'' bit and fine tune to your liking.