There was a liquid cheese fountain featured at one point, which should be fairly simple to adapt to run on chocolate. This is it.
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Chocolate fountains use an auger pump to take advantage of the viscosity of the chocolate while not introducing air. Build a screw and put it in a cylinder and you'll be able to pump chocolate. Someone recently made the 'turkey gravy' fountain by making their own peristaltic pump (rollers that squish a hose)...this would work great for chocolate too.Then you need the base, a heated, temperature controlled vat to keep the chocolate from solidifying or burning.then you need a way to seal the assembly so that the chocolate doesn't get into the motor -- same type of bearing/seal used on a blender--waterproof and stable.Lastly, it needs tiers to have the chocolate fall off...Based on the complexity of the project and the cost of parts/cost of a new chocolate fountain, in most of the first world its cheaper/easier to just buy one.