I have made my own version of common Oxalic Acid vaporizers but mine runs on 110VAC and has a digital PID temperature controllerIMG_1515.jpgIMG_1521.jpg. I don't have a 12V battery to lug around but my hives are close to the house and I have an extension cord! I am thinking of making more to sell in the "for sale" section if there is much interest. I use a high power 250W heater that gets the CNC machined aluminum cup up to sublimation temperature in under 75 seconds. Thanks for your feedback!