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3D printing fumes are NOT good for you. Malcolm Langille made an enclosure for his Type A 3d printer with exhaust system to extract the fumes outside of his house.
I wonder how the temperature change and build surface cooling due to strong air movement affects the 3d print quality.




Source page with more details:

http://www.3dhacker.com/category/667/Type-A-Machines/listings/519/Enclosure-External-Exhaust-and-Fan.html

http://www.thingiverse.com/thing:197099

Marius Kintel, the creator of OpenSCAD, discusses the merits of Multi-color multi-material 3D Printing on the ORD Solutions 5 extruder system.

Yes, yes ... 3d printing with frozen water. ICE is project by  McGill University (Montreal, Quebec). I am not surprised ice 3d printing is developed in tropical Canada. If this technology would be scaled up it could print building sized structures.

3d printed ice chain

Source:

http://www.arch.mcgill.ca/prof/sijpkes/ice/

PDF document with more details on ice 3d printing process, machines and technology:

http://www.arch.mcgill.ca/prof/sijpkes/ice/_source/REPARTI_ice_poster.pdf