Hi, this is my first post here on the forum although I've been following some other threads recently. I'm currently working on a thesis project with a colleague of mine in which we are engineering a night time pacifier. We are at the moment trying to find a way to make the shield of the pacifier light up using as a light source a few LEDs that will need to be placed safely inside the cover of the pacifier (which is located at the back of the pacifier in the center of the shield). I've heard that PMMA material has excellent light transmitting properties so the idea is to use such a material around the edge of the shield. The material would have to be string or rod like in order to practically fit it at the edge with a thickness of a few millimeters to 1 cm. Now, my two main questions are: Is there such a material that will transmit light from the LEDs if they shine perpendicularly on the rod-like material. Since the material will be placed around the edge of the shield while the LEDs are at the center there is no way to direct the light from the LEDs through either end of the rod. The cover will have to be transparent off course (at least where the LEDs are meant to shine out) but will the light physically be able to travel through the rod, making it shine, from that 90 degree angle on the rod? Finally, is there such a material that is safe to use for children? It will have to be soft enough to bend and chew withought shattering baby teeth and on the chemical side I have been informed that the material should be PP and not PC. Any advice and ideas with the aim to solve this puzzle are much appreciated.