Maybe with further augmentation to the process. The 3D printing seems to leave pretty big grooves on the glass - which can distort the passage of light. For any

Maybe with further augmentation to the process. The 3D printing seems to leave pretty big grooves on the glass - which can distort the passage of light. For any real optical application, that will have to be removed somehow. Such as baking the glass structure in a high heat oven with a centrifuge/fast spinning base and some kind of mould to put the initial piece on. The high heat and spin action could, in theory, fuse the individual grooves for a more uniform dispersion of light, and the mould shape would further press on the glass to maintain or alter its shape to be closer to a lens. Finish that off with fine “sanding” and/or polish, and that might do the trick? Honestly, experimentation might be the only way to find out.