Improved my Frontier water straw yesterday by adding two end caps protecting the ends of the filter and straw from dirt, and also making them a single piece for convenience of carrying in the pocket (I hated the straw being longer than the body). It also a lanyard friendly thanks to the snug fit achieved with a bit of hand grinding and polishing. Made of PLA plastic, but if I'll like carrying it that way I'll print it in ABS. See the gallery