3D printing is an ideal business; however you have to consider lots of factors before engaging in this kind of venture. One sure thing to market your prototype creations is through an online shop. This is what I did when started 3D printing custom made stuff like photo frames, miniature toys and kitchenware. Through the Internet, I found my filament supplier which is 3D2print, 3D designing software and 3D printing marketplace such as Shapeways and i.materialise.