Machines for treatment of materials; machines for manufacturing; metal working machines; industrial robots for use in manufacture; robotic metal working machines; robotic and CNC machines for treatment of materials and for use in manufacture; machine tools; tool heads; apparatus and devices for machine control; tool and tool head changers; docking systems for tools and tool heads; docking systems and tool or tool head changers for engaging and disengaging additive manufacturing tool heads/machine tools; parts and fittings of the aforesaid goods