To confirm the reproducibility, the upcycling procedure was repeated with printed samples of all three lactate esters and the desired product could be recovered each time (SI Figures ). A representative upcycling procedure of a printed structure using the MeLMA formulation with a weight of 900 mg, yielded 844 mg of the DME crosslinker. Thus, printing new structures using the upcycled crosslinker obtained in this fashion could be achieved, proving the circularity of the process.