They weren't blaming you for the cost. They were asking you to make a smaller version. I, too, admire your gears and want to own them. Shapeways charges for the amount of material used. Since the 9 X 5 X 11 cm version costs so much to print, and I've seen many other designs scaled down to cheaper versions, I'd naturally like to request that you offer this awesome invention at a smaller size so I can afford it!