The thing is with dds is any one can make them.. from anything. The only bit thats the pain is the cam. The rest is great to find and put together and they will work and put ink in no probs. I use carts with mine as it takes out all the wopple of a normal needle in a dd. jesse most rotaries are based round a dd princables. Slide rotaries are dds with the cam goes to a slide then to the needle. Because its wrapped in a nice design of ally and plastic and has $400 price tag, most dds costing $20 would do the same..my next dds motors are these for the fun of making dds.

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