The gear shift is just such a fun concept to apply to this kind of multi-ink pen, and it could well make for a better fidget toy than an actual manual transmission. Might be a little wide to ...

It worked well on leather and wood and the like ... we did our best to capture the essence of what about the pen makes continuous, dependable ink transmission possible, but the video below ...

As it was dipped into an ink well, it drew a large amount of ink up its surface. With a glass pen, one could write a paragraph or up to half a page without having to reload the tip. Conventional ...