Thanks to MrRip for the original design. I printed it and found that my sockets fit a little loose. I simply made the detent larger so it holds the socket in place better. If your print creates a fit that is too tight, a little sandpaper on the detent will make it smooth. On my printer, the socket clicks in place without any post processing.
I printed in PLA with 5 perimeters, 75% infill 200C. ABS would probably be even better.