Interesting. I wonder if this could be used to print telescope mirrors if you could get an "ink" that has high thermal stability, or if that would be in conflict with the low temperature printing.
Now that’s I think about it, one could in theory use the exact same process for plastic-polymer lenses too, albeit at lower temperatures (better).
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.