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I made one of these out of a free microwave motor and 2 medicine cups. I simply took out the motor and attached a power cord to it.
The microwave motor usually has a little piece that fits under the plate to spin. Simply superglue a medicine cup to that and then place another medicine cup in the first and mix in that. The cup should spin nicely inside the other one without slipping. If find it is still good to scrape the sides though to get a good mix of e-tex or ex-74. I use small ball bearings and mix for about 5 min. Very few bubbles, although as long as it is not humid those always come out for me on the plug. I clean the ball bearings with denatured alcohol. You can also make a nice stand for it out of a coat hanger like the pacbay.
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