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Thanks! I could not find any missing screws around the steppers. I also noticed that they used much larger allen screws and this screw was the same as the ones on the arms where none was missing. This led me to assume that it was simply one screw too many.... Anyrate from this reply I dared to start ...

Greetings I'm a computer scientist that wanted to start doing prototypes using the cool 3D printing technology. I picked the Orion Delta printer since I was curious about the delta design and the "ready to print" feature was a nice selling point. Unfortunately the printer got some shipping damages ...