Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5412167.
I wasn't very happy with the cases that came with either the WOW Stick or the WOW Pen Drill as one had a loose top the other didn't allow for a tool to be stored with an attachment in place.
This initial design fixes those two issues with an unhinged press-together lid, which can act as a handy screw tray. I didn't have strong enough magnets for a magnetic clip like the WOW Stick case which I did like so this works kind of well enough - I've not tried printing the lid with hard PLA or similar but is fine with a 95 TPU.
I printed the base with a generic white PLA I had kicking around and the lid with eSun blue TPU. About 160 grams total is needed for both top and bottom.