Improved apparatus and methods for forming a layer of material over a surface of a previously formed cross section of a three dimensional object in {HEAD ~ anticipation} of forming {TAIL ~ a next cross section} of the object out of the layer 
Improved apparatus and methods for forming a layer of material over a surface of a previously formed cross section of a three dimensional object in { HEAD ~ anticipation } of forming { TAIL ~ a next cross section } of the object out of the layer
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH