I noted your concerns about the rotary movement and investigated as I am very interested in Blacksmith Genesis Product. I found that the tangential speed, which is proportional to the radius of the disk, will be increased as the radius increases by lowering the rotational speed thus the disk will rotate slower when the printhead is at the edges of the circle, and increasingly faster as it moves towards the center. This seems to be adequate solution to coping with 3d printing and I am going to go ahead and get one via Indiegogo kickstart perk. Just hope they make iot to the goal so I cna get my 3d printer.

Oh By the way, I am not at all related or a friend of any of the Blacksmith Team.