Having spent a great majority of my childhood creating fantasy worlds filled with tiny yellow figures, I find this homemade LEGO printer absolutely amazing. The ingenuity of the machine is impressive, and the inclusion of the LEGO people and pieces is wonderful.
On a related note, I recently came across a great looking retrospective book on LEGO. The LEGO Book is beautifully laid out, and details the history of the company and their products. A must have for any LEGO fan.