Nicholas Lewis has discovered that the Blue PLA filament build material he's been using glows when illuminated by black-light. The picture above tells the story. Imagine the build possibilities!
The PLA is available from UltiMachine at the link below. From the description:
This is Natureworks PLA4042D extruded into 3mm filament. This is a wonderful build material. It has minimal warp when cooling. The pigments used in our color PLA are all bio-friendly and designed for use with PLA.
Priced at USD$60 and the black light is Not Included!