4D printing has steadily become an emerging area of advanced manufacturing research and has produced some
truly fantastic innovations. Previously we have demonstrated the 3D printing process based on PET-RAFT
polymerization, and its subsequent capability in the post-production modification of surface properties. In this
work, (1) we further optimized the PET-RAFT 3D printing formulation by replacing RAFT agent CDTPA
with BTPA and adjusting the monomers composition; (2) we also observed the photodegradation of the
photocatalysts EB and EY under 405nm light and the effects this has on 3D printing; (3) we then did successful
3D printing using a commercial 405nm DLP 3D printer, with an improved build speed of up to 2286 µm/hr;
(4) lastly, for the first time we have demonstrated a method for growth induced bending of a 3D printed strip,
where the growth on one side of the strip causes stress and the strip bends accordingly to reach a more
comfortable position.