Snug fit case for the Apple Pencil with a threaded cap.
There are some similar cases around. I designed this one to be: a) snug, so it doesn't rattle around inside very much, and b) have a threaded cap, as some of the others I looked at either use a snap mechanism which didn't work for me, or just press fit. The threading seems durable and works well after a few test fits.
I also questioned why I would need such a thing, until I managed to snap off the tip in my pocket, leaving part of it still in the pen. Required a replacement.
Link to latest source: http://a360.co/2tN29qF
Designed for a 0.4 mm extrusion width.