This is a print-in-place design for the Kuru Toga pencil. I loved the pencil, but the stock eraser sucked. This is a drop-in replacement that is compatible with the Papermate jumbo eraser or a standard pencil eraser and has a similar mechanical system to the Papermate jumbo design.
You have to put a little support on a single part, as seen in picture 3
The author hasn't provided the model origin yet.