* 15C changes to blue when its temperature is less than 15C (59F) (However, they say it can become permanently white if exposed to UV light - so don’t put these prints outside!
* 30C changes to black when colder than 30C (86F)
* 45C changes to white when warmer than 45C (113F)
http://www.fabbaloo.com/blog/2014/12/28 ... -availableAnother unusual pair of filaments is now provided by ProtoPasta: Stainless Steel PLA & Magnetic Iron PLA. The stainless steel filament can be polished to a shiny finish, or as they explain, “left unfinished for a cast metal appearance”.
Their Magnetic Iron PLA is truly magnetic when printed, but that’s not all. The iron can oxidize, producing a rusty surface. Thus, this filament offers two unusual properties.