Alien xenomorph facehugger egg fully merged.  The original model came in numerous pieces and for some reason, the layers never fully matched up for me over 2 prints.  It took some time to merge them in Blender including sculpting the separations out cleanly.  It's still a fantastic model, but now it's all one unit.  You can separate into chunks however you need within Blender or your slicer and the layer lines and levels should be a perfect match.