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Just made it on an Ultimaker2. Superb! Use a small screwdriver to GENTLY separate the parts so they move, one or two of them may be joined to start with. Do NOT force the thread, make sure everything is free and separate first before turning, PATIENCE. A small amount of lubricant on the thread helps once things get moving.
An impressive design, one of the finest demonstrations of 3D printing I have seen.