3D_printing is a fascinating & potentially dangerous form of Printable Matter.
http://www.forbes.com/sites/andygreenberg/2013/05/09/state-department-demands-takedown-of-3d-printable-gun-for-possible-export-control-violation
http://beforeitsnews.com/alternative/2013/05/breaking-3d-printable-gun-ordered-to-shut-down-by-government-2642252.html
http://www.infowars.com/breaking-3d-printable-gun-ordered-to-shut-down-by-government,
http://www.youtube.com/watch?v=9ZnKXRgFZVs
http://www.examiner.com/article/3d-guns-ordered-down-are-3d-printable-guns-the-wave-of-the-future
http://pinterest.com/ybba/printable-matter
http://www.technobuffalo.com/2013/05/11/pirate-bay-distributes-3d-printed-gun-plans
So, in addition to the occasional fire concern another issue looms for any train, bridge, tunnel or building.
Obviously, 3D printed objects will be under strict control in certain environments.
http://www.dailymail.co.uk/news/article-2323158/How-Mail-On-Sunday-printed-plastic-gun-UK--took-board-Eurostar-stopped-security-scandal.html
In effect, the 9-11 2008_Channel_Tunnel_fire became a 999 emergency_on_the_UK side of the tunnel.
http://www.raib.gov.uk/publications/investigation_reports/reports_2010/reportet2010.cfm
http://www.telegraph.co.uk/travel/travelnews/2800485/Channel-Tunnel-closed-after-freight-train-fire.html,
http://www.guardian.co.uk/uk/2008/sep/12/transport.channeltunnel1
The 1996_Channel_Tunnel_fire,
http://writer-tech.com/pages/summaries/summchunnel.htm
Collectors & movie set props would undoubtedly like to have the quick ability to make a nonfunctional replica of various items. The M1911_pistol started its service_history in the year 1,911.
1,911 , 911 , 191 , 119 , 1119 , etc.
Some flights have already had enough disastrous problems.
http://www.esquire.com/features/flight191, http://copycateffect.blogspot.ca/2012/03/flight-191.html,
http://jfvrinfo.blogspot.ca/2012/04/flight-191-enigma.html
Remember, owning & operating a Porsche_911 doesn't necessarily make you a more ferocious & careless driver. Some movie & TV productions might not want to have a totally CGI set or resort to actually destroying real cars & things. Therefore, 3D printed replicas can provide for a more realistic looking movie set. The 2013 movie, Oz_the_Great_and_Powerful used a combination of real actors & sets integrated with CGI effects.
Lots of collectors might want to have 3D replicas of big game animals or guns. For years, many people have had replicas of various paintings & other art forms.
