A multimaterial bio-ink method using polyethylene glycol crosslinking is 
presented for expanding the biomaterial palette required for 3D bioprinting of 
more mimetic and customizable tissue and organ constructs. Lightly crosslinked, 
soft hydrogels are produced from precursor solutions of various materials and 3D 
printed. Rheological and biological characterizations are presented, and the 
promise of this new bio-ink synthesis strategy is discussed.