Why all the bother with 3d-printed gel shapes? Why not just use a mat of these things, all glowing, and then put it behind an LCD panel. Then you can have moving pictures without all the bother of 3d printing.
Then you can take the next step and both their apparent output further by replacing the algae with tiny blue LED modules.
Then you can take the next step and both their apparent output further by replacing the algae with tiny blue LED modules.
I have a genetically engineered luminescent petunia plant. It’s neat, but a ways off from being useful for anything.