, ▁which ▁creates ▁a ▁polym er . ▁Through ▁these ▁c oval ent ▁b onds , ▁the ▁property ▁of ▁the ▁solution ▁is ▁changed . ▁The ▁build ▁plate ▁then ▁moves ▁down ▁in ▁small ▁incre ments ▁and ▁the ▁liquid ▁polym er ▁is ▁again ▁exposed ▁to ▁light . ▁The ▁process ▁repe ats ▁until ▁the ▁model ▁has ▁been ▁built . ▁The ▁liquid ▁polym er ▁is ▁then ▁dra ined ▁from ▁the ▁v at , ▁leaving ▁the ▁solid ▁model . ▁The ▁En vision TE C ▁Per factory ▁is ▁an ▁example ▁of ▁a ▁D LP ▁rapid ▁pro tot yp ing ▁system . ▁ ▁In k jet ▁printer ▁systems ▁like ▁the ▁Ob jet ▁Poly J et ▁system ▁sp ray ▁phot opol ym er ▁materials ▁onto ▁a ▁build ▁t ray ▁in ▁ult ra - th in ▁layers ▁( between ▁ 1 6 ▁and ▁ 3 0   µ m ) ▁until ▁the ▁part ▁is ▁completed . ▁Each ▁phot opol ym er ▁layer ▁is ▁c ured ▁with ▁U V ▁light ▁after ▁it ▁is ▁j ett ed , ▁producing ▁fully ▁c ured ▁models ▁that ▁can ▁be ▁handled ▁and ▁used ▁immediately , ▁without ▁post - cur ing . ▁The ▁gel - like ▁support ▁material , ▁which ▁is ▁designed ▁to ▁support ▁complicated ▁geomet ries , ▁is ▁removed ▁by ▁hand ▁and ▁water ▁jet ting . ▁It ▁is ▁also ▁suitable ▁for ▁el ast om ers . ▁There ▁is ▁another ▁type ▁of ▁in k jet ▁printing ▁system ▁available ▁in ▁the ▁market ▁that ▁can ▁print ▁a ▁phot opol ym er ▁in ▁a ▁layer - by - layer ▁manner , ▁with ▁intermediate