The RepRap is an open-source, low-resolution, ultra cheap, filament-based 3D printer. Here, from Wikipedia:
The RepRap project is an initiative to develop a 3D printer (RepRap, short for "replicating rapid prototyper") that can print most of its own components. As an open design, all of the designs produced by the project are released under a free software license, the GNU General Public License.
So, Adam Hoyle just pointed me at Faberdashery.co.uk, who are making "sweet-smelling" spools of filament in many interesting colours, compatible with said RepRap (and Makerbot, by the size, anyway. Good news for us: we've been paying ££ to UK customs for our NYC-sent spools). From Faberdashery's Twitterstream, to WatsDesign's Flickrstream:

He looks thoughtful.
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