LayerWise does not have closed-loop control http:

LayerWise does not have closed-loop control

http://appft.uspto.gov/netacgi/nph-Parser?Sec...S=Mercelis

Evident from the above patent, LayerWise's system is ANOTEHR OPTICAL systems that is dependent on a camera. Interesting too is that the camera is a simple consumer based technology that uses a CCD or CMOS:

Claims 6 & 7:

6. The apparatus of claim 5 wherein said spatially resolved detector is a CCD or a CMOS camera.

7. The apparatus of claim 6, further comprising means for selecting the area of pixels to be read out form the camera's whole chip.

Their other patent only involves the building of walls that is supported by structural beams:

http://appft.uspto.gov/netacgi/nph-Parser?Sec...aerenbergh