This is an interesting concept...drawing 3 dimensionally! And it sounds like it will be priced in a way to make it accessible.
http://www.springwise.com/style_design/3d-printing-pen-draw-real-objects-existence-raises-usd-2m-kickstarter/
And here is there website: http://www.the3doodler.com/
Should the library have these when they are available? Should we circulate them in-house? Let people take them home? Should they have to pay for the plastic???