Buy at http://www.shapeways.com/model/38791/caution_cube.html Copyright (c) 2009 Oskar van Deventer. Caution Cube is a twisty puzzle like Rubik's Cube. Its edges have gears that connect opposite faces. Apply extreme caution when solving this novel twisty puzzle. The razor-sharp gears turn, so you can easily hurt yourself. Wear protective gloves and keep this puzzle away from children. This is not a toy! This puzzle was 3D-printed using nylon-powder SLS technology, which explains its price. It is the very first prototype, costing its designer and maker a lot of money to create. Please do not confuse it for a cheap mass-produced puzzle. Based on this prototype from 2009, a mass-produced version of this puzzle has been made for sale by Mefferts: http://www.mefferts.com/products/details.php?lang=en&category=13&id=331.