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This is really cool looking stuff - very cool video demo too: UV PLA

It is available on the E3D-Systems site. A bit pricey but hey, it's cool! I got enough to make a couple of fly fishing reels. Should be pretty cool out on the water.

If I bought this I'd just be printing stretchlets all day for a bunch of raver kids. Then again it could fund a new printer...

I have a variation of this in ABS.

Called sunburnt chameleon. Changes just as dramatically and looks really neat.

Turns purple in sunlight from white.

I also have 2 other cool color changing filaments, called fluro chameleon (green to yellow at 33c and glows in the dark) and hot chameleon (purple to pink at 33c).

But even far cooler but less flashy is High impact crystal ABS. It's ABS, but must be printed at 260c or higher. Comes out decently clear, but when you vapor polish this stuff it is the clearest by far of any filament I have used so far. Looks like injection molded clear plastic if done right.

Almost forgot, mine was pricey too, and comes from a place called fantasic plastic in Newzeland. Was amazed how quick it came as well, all on spool and vacuum packed so it stays dry until you use it. I'm done with buying unspooled filament, too much trouble.