Print with 0.4mm nozzle, 0.2mm layer, no support. The walls are single layer, semi-flexible. If you intend to put it on a flash drive that heats up a lot, try more heat resistant material. For everything else PLA works fine. Doesn't work on some USB connectors that have no latch holes.

Update: I added a hole to tie the cap to the cable/flash drive to prevent loss. DO NOT use that as an only way to hold to your USB device!

I also added a spiral vase model. you can try that one too. The 3mf file has all the settings needed for bamboo studio. I'm not sure how it'll work for other slicers.