We need to determine or get information on weight limits for E3Ds tool changer and docks, and how cantilevered that mass can be. They have been testing with bowden based designs, so our direct drive extruders will be much heavier.
E3D has said that they can do 500g, or 1kg with the motion slowed down, using their motion system. Those were limits of the motion system though, so potentially more could be done. Additionally, the spring could be changed out to increase the weight limit even further.