3D printing ANSYS History of engineering & technology ITAP K9 glass MATLAB Technology: general issues abrasive grains active grains number additive manufacture additive manufacturing brittle fracture burst processing chip formation conductive mask diamond turning dimensional uniformity ductile-brittle transition electrochemical machining femtosecond micromachining finite element analysis gel microspheres grinding force grinding forces grinding temperature hydrophilic acrylic intraocular lens laser assisted turning laser-induced periodical surface structures lithography simulation