Creopop is new 3d drawing pen that uses UV light for curing of the gel ink material. It doesn't produce any "dangerous" heat but the ink is more expensive then the standard filaments (which you can make yourself in filament extruder even more cheaper). Types of ink include elastic, magnetic, glow-in-the-dark, scented ink, body painting inks, ink that changes color with temperature and ink that conducts electricity made for school science classes.CreoPop is battery operated and charged through micro USB, I wonder if the battery is user replaceable.
http://creopop.com/
It will be on Indiegogo soon.
Here is the CreoPop review by Mashable:
