EDIT: I've made a better detachable version! I recommend using it instead:
A short 1-slot USB implement. It fits very nicely in my Roxon Mini Flex Companion. For usb drive, you would want to use an ultrasmall drive like this or similar: https://a.co/d/1OIQGg3
I recommend printing in something strong and wear-resistant like PC, but PETG or ASA could probably work. Avoid PLA, as the low melting temperature and poor wear-resistance might cause problems. I printed at 0.15 layer height. I also highly suggest removing this implement from your multitool before plugging into a computer, as to avoid damaging the USB port.
Installation: On the USB drive, it actually has a thin cover glued on it; find the seams to the cover on the bottom, and gently pry it off.Superglue the drive into the 3d-print, including the sides; This is less about keeping the drive in, and more about using the drive to increase structural integrity, as the 3d-print gets pretty thin.
you can find the roxon multitools here: https://roxontool.com/
---
V1.2 - made implement slightly shorter, tweaked dimensions for better usb fit.
The author remixed this model.
The blank was used as a base, heavily edited to fit a USB drive.