I love this. After are you going to fire it in a kiln, or can you do it in the home oven ?
I was curious, is the air pressure controlled thru the arduino or ? how are you controlling the flow ?
Also, is there a kit offered somewhere ? Or do you have a link to a DIY ?
Thank You, this is a great idea!
I have yet to fire the things I have printed but I will soon. And the air pressure is all controlled via an air compressor that is set to a consistent pressure. I sort of made it myself but all you need is (http://www.amazon.com/Liquid-Cartridge- ... er+syringe) and an air hose attachment. its pretty simple.
This solenoid valve should work with the ramps board in place of a heater cartridge. Its either on or off. So you would have to modify Marlin to get it to work correctly. It operates at 12V DC 1.5 AMps. You could get 2. Once connected to the inlet of your compressor the other to the outlet. switch them on/off together to do retractions.
Not to make it sound easy. It would take an extensive amount of trial and error.