Y-shape objects with different critical angles were first 3D-printed by a commercial 3D printer (Asiga Max X) using a commercial resin (Asiga PlasCLEAR 2.0), followed by a cleaning process with 2-propanol and a curing process under 365 nm UV for 30 min. The printed objects were coated with PDI-tetraPS (DP100, 100 mg ml -1 in toluene) through dip coating, followed by a drying process at ambient condition.