▁grant ▁access ▁to ▁their ▁technology ▁( an ▁open ▁SDK ). ▁On ▁the ▁other ▁hand , ▁ 3 & DB ot ▁is ▁an ▁Ar duino ▁ 3 D ▁printer - ro bot ▁with ▁whe els ▁and ▁O DO I ▁is ▁a ▁ 3 D ▁printed ▁hum ano id ▁robot . ▁ ▁So ft ▁sens ors ▁and ▁actu ators ▁▁▁ 3 D ▁printing ▁has ▁found ▁its ▁place ▁in ▁soft ▁sens ors ▁and ▁actu ators ▁manufact uring ▁inspired ▁by ▁ 4 D ▁printing ▁concept .< ▁The ▁majority ▁of ▁the ▁conventional ▁soft ▁sens ors ▁and ▁actu ators ▁are ▁fabric ated ▁using ▁mult iste p ▁low ▁yield ▁processes ▁ent ail ing ▁manual ▁fabric ation , ▁post - processing / assembly , ▁and ▁length y ▁iterations ▁with ▁less ▁flex ibility ▁in ▁custom ization ▁and ▁reprodu ci b ility ▁of ▁final ▁products . ▁ 3 D ▁printing ▁has ▁been ▁a ▁game ▁chang er ▁in ▁these ▁fields ▁with ▁introdu cing ▁the ▁custom ▁geomet rical , ▁functional , ▁and ▁control ▁properties ▁to ▁avoid ▁the ▁ted ious ▁and ▁time - consum ing ▁aspects ▁of ▁the ▁earlier ▁fabric ation ▁processes . ▁ ▁Space ▁▁ ▁The ▁Zero - G ▁Pr inter , ▁the ▁first ▁ 3 D ▁printer ▁designed ▁to ▁operate ▁in ▁zero ▁gravity , ▁was ▁built ▁under ▁a ▁joint ▁partners hip ▁between ▁NASA ▁Marshall ▁Space ▁Fl ight ▁Center ▁( MS FC ) ▁and ▁Made ▁In ▁Space , ▁Inc . ▁In ▁September ▁ 2 0 1 4 , ▁Space X ▁delivered ▁the ▁zero - gravity ▁ 3 D ▁printer ▁to ▁the ▁International ▁Space ▁Station ▁(