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Summary A super simple bubble maker using a 40 mm centrifugal fan and a 1:100 geared 6v dc motor.. Instructions print at .25 mm layers. I have put wiring condutes in the the base of the machine. So after completing all the wiring the flat base can be glued to the base hiding everything... ( do it after testing the machine ) I used a 12v 40 mm centrifugal fan and used a simple 2 resistor voltage divider to run the 6v motor... alternatively you can also run the 12v fan at 6v .. Caution the bubble maker is really fast and will make a real mess with bubbles all over the place...