Liz Havlin

Most consumer 3-D printers use "ink" made of colored plastic line.

 But despite the self-reliant and Earth-friendly bent of many 3-D printing hobbyists, it's surprisingly difficult to find 3-D printing line, or filament, that's made of recycled plastic—even though the type of plastic used, ABS plastic, is easily recyclable from old plastic bottles.

 Now a Seattle-based entrepreneur, Liz Havlin, aims to change that with a machine that turns recycled plastic into filament suitable for loading into any mainstream 3-D printer.