A pack of 48 pencils is $1.88 at Walmart. While I certainly congratulate the engineers on their creativity, as a product this seems like a solution in search of a problem.
A pencil is even 0€ at Ikea, but that doesn't make this less neat.
Last I checked, Ikea pencils are those stupidly short ones. Now you can take two or three and use this tool to make a full size one!
It's in the spirit of not wasting.
I get that, but is it even accomplishing that job, once you factor in petroleum for the plastics, the glue, the packaging, etc.? Is all that money, effort, and environmental impact worth it to salvage the last inch of a used pencil? I doubt it.
Another way to phrase it is it's in the spirit of finishing all the fries that come with the burger. We're not always calculative creatures. Sometimes the act of completion matters more.