Are you kidding me? Why is this news? News in 2017? This was done and researched 3 years ago. In 2014.
https://benchapman4.wordpress.com/20...acetone-vapor/


And a 3D-CMF pen was on the market 3 years ago.
https://www.kickstarter.com/projects...or-3d-printers
http://www.solidsmack.com/fabricatio...s-smooth-silk/

And its so common NOW its on several filament sites and has been for years:
http://www.makergeeks.com/abs-3d-pri...thing-pen.html
https://www.filabot.com/products/abssmootingpens


Sorry. They didn't develop anything new. They re-invented the wheel.