Actually 3 reasons for the price dropping to 100: - optimized drawing as you guessed - we recently replaced all our mirror and lenses with higher quality ones from new supplier and I can cut around 20% faster - I was little bit late on this one and being for a personal project, not corporate, I discounted our rate ;-) Feel free to ask for Reprap forum price if/when you ask for quote, we will chaby Plixo - Singapore RUG