I place a 32 oz mug in the center of my chamber and I place my pen blanks in that. That allows me to use much less cactus juice. I also place an even smaller glass beaker into the mug when using colored cactus juice to reduce the amount of resin I am using even further. Since I do not want to use all of my cactus juice up on one color. It only allows me to run 3 blanks at a time, but its much more economical. The larger chamber leaves you open for stabilizing large parts if you need it.