Here's a clever idea to make your ballpoint pen last much longer. By twisting the cartridge into a spiral, the ink tube is twice a long with double the ink supply of a standard throwaway ballpoint.
Apparently you can't just make the ink tube wider, as the pen would become far too likely to leak, so this spiral approach keeps the original inside diameter.
At first this sounds like a no brainer, but I wonder how many people actually use up all of the ink in a ballpoint before losing or breaking it?
The T&T Pen-ink Chamber has been entered for an iF concept design award.
Via Yanko Design