Changes

'''2017''' The first 3D printed house that humans could live in was built in Russia <ref>{{Cite web|url=http://www.3ders.org/articles/20171024-amt-specavia-builds-europes-first-habitable-3d-printed-building.html|title=AMT-SPECAVIA builds Europe's first habitable 3D printed building|website=3ders.org|language=en-US|access-date=November 20, 2019}}</ref>

'''2017''' The first 3D printed house that humans could live in was built in Russia <ref>{{Cite web|url=http://www.3ders.org/articles/20171024-amt-specavia-builds-europes-first-habitable-3d-printed-building.html|title=AMT-SPECAVIA builds Europe's first habitable 3D printed building|website=3ders.org|language=en-US|access-date=November 20, 2019}}</ref>

== How They Work ==

== How they work ==

[[File:STL sample 2.png|thumb|A computer model of an object before printing|alt=]]

[[File:STL sample 2.png|thumb|A computer model of an object before printing|alt=]]

=== Modelling ===

=== Modelling ===

The first step in 3D printing something is to make it on a computer. People do this with [[computer-aided design|CAD]] (Computer Aided Design) software or a [[3D scanner#Hand-held laser scanners|3D scanner]]. To design [https://simple.wikipedia.org/w/index.php?title=3D_model models] in CAD, people start with basic shapes, and build from that point. 3D scanners are machines that take lots of measurements of the object and automatically make a model on the computer. They can be very fast, but are also more expensive.<ref>{{Cite journal|last=Vermeulen|first=M. M. P. A.|last2=Rosielle|first2=P. C. J. N.|last3=Schellekens|first3=P. H. J.|date=January 1, 1998|title=Design of a High-Precision 3D-Coordinate Measuring Machine|url=http://www.sciencedirect.com/science/article/pii/S0007850607628716|journal=CIRP Annals|volume=47|issue=1|pages=447–450|doi=10.1016/S0007-8506(07)62871-6|issn=0007-8506}}</ref>[[File:UHTC Propeller.webm|thumb|A 3D printer printing a propellor. The video is 4 times faster than real life.|left]]CAD models are usually saved on computers as [[STL (file format)|STL]] files. They are saved as lots of triangles, which saves space on the computer.<ref>{{Cite book|url=https://www.worldcat.org/title/jurnal-teknologi-science-and-engineering/oclc/889967279|title=Jurnal Teknologi|date=1977|publisher=Penerbit UTM Press|location=Johor Bahru|language=en|oclc=889967279}}</ref>

The first step in 3D printing something is to make it on a computer. People do this with [[computer-aided design|CAD]] (Computer Aided Design) software or a [[3D scanner#Hand-held laser scanners|3D scanner]]. To design [https://simple.wikipedia.org/w/index.php?title=3D_model models]{{Dead link|date=September 2021 |bot=InternetArchiveBot |fix-attempted=yes }} in CAD, people start with basic shapes, and build from that point. 3D scanners are machines that take lots of measurements of the object and automatically make a model on the computer. They can be very fast, but are also more expensive.<ref>{{Cite journal|last=Vermeulen|first=M. M. P. A.|last2=Rosielle|first2=P. C. J. N.|last3=Schellekens|first3=P. H. J.|date=January 1, 1998|title=Design of a High-Precision 3D-Coordinate Measuring Machine|url=http://www.sciencedirect.com/science/article/pii/S0007850607628716|journal=CIRP Annals|volume=47|issue=1|pages=447–450|doi=10.1016/S0007-8506(07)62871-6|issn=0007-8506}}</ref>[[File:UHTC Propeller.webm|thumb|A 3D printer printing a propellor. The video is 4 times faster than real life.|left]]CAD models are usually saved on computers as [[STL (file format)|STL]] files. They are saved as lots of triangles, which saves space on the computer.<ref>{{Cite book|url=https://www.worldcat.org/title/jurnal-teknologi-science-and-engineering/oclc/889967279|title=Jurnal Teknologi|date=1977|publisher=Penerbit UTM Press|location=Johor Bahru|language=en|oclc=889967279}}</ref>

=== Printing ===

=== Printing ===

After the machine has finished printing, sometimes people [[Surface finishing|finish]] the model. This means making small fixes to make it look better. Finishing includes taking off material that the printer placed to support the model. This sometimes can take a lot of time. There are ways to make it quicker, but it is often easiest to remove plastic by hand.<ref>{{Cite web|url=https://www.3dhubs.com/talk/t/best-way-to-remove-rafts-supports-and-other-extraneous-filament/494|title=Best way to remove rafts, supports and other extraneous filament?|date=January 30, 2015|website=Talk Manufacturing {{!}} 3D Hubs|language=en-US|access-date=November 20, 2019}}</ref>

After the machine has finished printing, sometimes people [[Surface finishing|finish]] the model. This means making small fixes to make it look better. Finishing includes taking off material that the printer placed to support the model. This sometimes can take a lot of time. There are ways to make it quicker, but it is often easiest to remove plastic by hand.<ref>{{Cite web|url=https://www.3dhubs.com/talk/t/best-way-to-remove-rafts-supports-and-other-extraneous-filament/494|title=Best way to remove rafts, supports and other extraneous filament?|date=January 30, 2015|website=Talk Manufacturing {{!}} 3D Hubs|language=en-US|access-date=November 20, 2019}}</ref>

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== Uses ==

== Uses ==

=== DIY ===

=== DIY ===