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Where is Tim? Sorry I'm late guys, ok let's get started Lets do it! 3D printing!!! 3D printing, is a type of additive manufacturing and is used to create 3D objects This is usually done with a file containing information about each layer in the structure you want to make along with a printer The printer build the structure layer by layer with your own choice of printing material The materials used can vary from metals to ceramics but the most common is plastics We also have different types of 3D printing The three most used 3d printing methods are Did you say stereolithography? That's SLA for short I've even brought a book about that SLA involves the curing of a liquid photosensitive polymer through the use of an irradiating light source With the help of CAD software light is used to draw the shape on the surface the tub containing the photopolymer Because photopolymers are light-sensitive the resin solidifies and forms a single layer of the desired 3D object An elevator platform descends or ascends a distance equal to the thickness of a single layer of the design into the photopolymer vat A resin-filled blade sweeps across a cross section of the layer re-coating it with fresh material The subsequent layer is traced, joining with the previous layer thus a complete 3D object can be formed using this process So, what do you have to contribute to this project? Well, I got more information on the chemistry and the material properties SLA takes advantage of the fundamental property of photoinitiators present in the prepolymer where the photoinitiator activates upon the absorption of UV or IR light to produce the reactive free radical or cation species The light controlled release of reactive species propagates the polymerisation reaction There are two main versions of photoinitiators with distinct polymerisation mechanisms These are the free-radical and cationic based polymerisation The free-radical mechanism involves the production of free radicals while the cationic involves the production of cationic species The final product produced depends on the mechanism involved It is generally cheaper to utilize the free-radical based acrylate prepolymer which has a lower shrinkage and higher reactivity while it is generally more expensive to utilize the cationic based epoxy prepolymer which creates a product with greater mechanical properties Generally, the free radical mechanism is inhibited by oxygen while the cationic mechanism is inhibited by water The advantage of SLA is that it is able to create small and intricate objects with resolutions of around 10 μm For reference, your hair is between 17-190μm thick It creates smoother surfaces than most other prototyping methods at a reasonably fast pace, allowing rapid prototyping The fabricated object must have relatively small slopes else removable supports must be added to the design adding complexity So knowing all this, what would you use it for? 3D printing can be used for everything from making a simple toy and repairing coral reefs to making medical tissues and building houses its all depending on what type of 3D printer and material you use A printer from china actually printed 10 houses in 24 hours using concrete So 3D printing is an incredible rapid and efficient manufacturing method But, as 3D printers are getting cheaper these devices are becoming more popular in private households which might promote consumerism of plastics and other materials WOW! Now we know a lot about 3D printing HOPE YOU DID TOOOOOOOOOO! The More You Know

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Duration: 4 minutes and 56 seconds
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Language: English
License: Dotsub - Standard License
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Posted by: nadun19 on Mar 24, 2017

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