Would any of you guys be interested in a premade cup for your homemade vaporizers? I have a place to get one made but if I buy a few in quantity I can get much better prices? I was planning on a design similar to some of those on the market. I have some numbers that are supposed to be from a commercial unit but could anyone suggest a better size? Hoping to keep the price under $30. Or maybe someone could give me a better idea for a design and I will forget the whole thing. I made one from thin sheet but it won't heat up over the whole area only near a thick sleeve I used for contact with the glow plug.