Funny story about a knock off of a 3d print: https://www.youtube.com/watch?v=j8eKv2clSX4&ebc=ANyPxKoKyg1-stb1d_xIbiqngY6yOI80h2N_Zft2vKUad8o-cRaU_E_KZNBfmK9kjjUruk_tdyrXd0GMpusbf6A_o5PE0dchCw Please have a look at his other videos for some really nice things done with 3d printet gears.