Thanks to @jymbob for the nudge, we've now made the STL file for the Pocket Driver separator available to download. You can access it here and 3D print your very own separator at home.
As a reminder, the separator is used to keep the Pocket Driver and Magnetic Bit Case sitting together snugly.
It will keep the two products together in a nice and neat way, with a loop for attaching a paracord so that the three parts can all be kept on a carabiner to keep them together when in use.
Let us know if you print one, or post a picture here on Cube Club!
Finally got to my local Hackspace which has a few 3D printers. Here's the separator part-done on the Ender 5
...and here it is doing its job, straight off the print bed:
I originally ran it at low quality (left) then went back and tweaked the settings up to get a nicer finish. Printed in black PETG.