Motion isolation apparatus, methods, and systems

A motion isolation apparatus comprising:

• a 3D printhead;
• a 3D print surface that is vertically movable between a plurality of different elevations relative to the 3D printhead;
• a floating frame that maintains an alignment between the 3D printhead and the 3D print surface at each elevation of the plurality of different elevations, the floating frame comprising vertical guides that are rigidly attached to the floating frame and operable to guide vertical movements of the 3D print surface between the plurality of different elevations, the floating frame having a floating frame stiffness;
• and
• a structural frame that supports the floating frame and has a structural frame stiffness,
• the floating frame stiffness being greater than the structural frame stiffness so that the structural frame elastically deflects to dampen oscillating forces applied to the floating frame by the 3D printhead during printing without disrupting the alignment.