That sounds like the perfect photonic crystal. But how to make ... in the model. The researchers will probably argue that this photonic crystal should only be used with very weak light fields.

From customized hearing aids to complex dental implants, 3D printing has transformed how we make finely detailed products.

[Matou] has always been entranced by the beauty of natural crystal formations [and has long wished for a glowing crystal pendant]. Once he got a resin-based 3D printer, he was majorly disappointed ...

Yes, you can now do some post-processing on printed parts to make T-glase crystal ... enough for 3D printed eyeglasses, but it’s more than sufficient for creating windows for a model, portholes ...