The Glowing Crystal Rock is a simple decoration that looks stunning.

The “rock crystal" is printed in transparent PLA or PETG, very slowly to optimize the transparency (around 50mm/s max). A faster speed can be used, and will produce a cloudier effect on the rock.

To assemble, simply fit as many Fairy Lights inside the rock as you want, and place it on the base. I used these from my local hardware store. Other battery-powered LEDs or tea-lights would work too!