Printed in black PLA, looks really nice with the knurled top and the "inscriptions" on it!
The lid threads fit well, but I'm not sure the lid will stay closed over time, especially during travel. A small notch to keep it in place could be useful, perhaps? The lid for the needle holder was a really, really tight fit, however. So much that I wasn't sure I'd get it off again in one piece once I actually managed to thread it and screw it down. It got a bit better after a few attempts, but it being a round, small design it's tricky to screw and unscrew. Maybe a wedge or wing-nut design would make it easier while still keeping it (somewhat) in the same style?