Precise printing on complex surfaces has always been a challenge. Only until recently, advancement in robotically actuated hydroprinting and models of liquid film distortion enabled precise registration of images onto complex 3D objects. However, it has its own limitation where concave hulls on objects are not printable. This project proposes a novel approach by coating objects with a photosensitive chemical, eliminating the need for an intermediate transfer medium. Utilizing collimated laser light, precise exposure of the chemicals is achieved, circumventing the issue of varying projection distances. This contact-free method allows printing in hard-to-reach areas, provided they are accessible to laser light.

In collaboration with Tobias KLEIN and supported by research assistants, my role encompassed the mechatronics design, machine construction, laser system design, development of machine control firmware, and CAD to CAM software, alongside the chemical formulation and process engineering for the photosensitive procedure.

The following image shows tests conducted to validate the effect of different laser power and speed settings. Gradient effect was achieved by a irregular hatching process with changing laser power.

The project was exhibited in various places including the Hong Kong Collateral event at the 18th international architecture exhibition – LA BIENNALE DI VENEZIA 2023. Curration by Sarah LEE, Hendrik TIEBEN, and Yutaka YANO.