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Week_05

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<h1><strong><span class="color">week_05</span></strong></h1>
<p class="lead"><strong>3D Scanning and Printing</strong></p>
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<h2><strong>Objectives</strong></h2>
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<ul class="about-list" class="pull-left">
<li>
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<strong>1)</strong> - <em>Understand the principle of 3D printer and the technique of the equipment.</em>
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</ul>
<br />
<div class="text-center">
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<h2><strong>Assignments</strong></h2>
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<li>
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<strong>1)</strong> - <em>Group assignment: test the design rules for your 3D printer(s).</em>
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<li>
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<strong>2)</strong> - <em>Individual assignment: design and 3D print an object (small, few cm3, limited by printer time) that could not be made subtractively.</em>
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<strong>3)</strong> - <em>Individual assignment: 3D scan an object (and optionally print it).</em>
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<h2><strong>Test the design rules for my 3D printer</strong></h2>
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<p>In order to test the different printers, the best option is to print a part that shows how the printer behaves in different situations. To do this, I have used a file from thingiverse.</p>
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<h4><strong>Generality of 3D Printer</strong></h4>
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<p>
① Material Extrusion (FDM/FFF)<br />
Fused Deposition Modeling (FDM), or Fused Filament Fabrication (FFF), is an additive manufacturing process that belongs to the material extrusion family. In FDM, an object is built by selectively depositing melted material in a pre-determined path layer-by-layer. The materials used are thermoplastic polymers and come in a filament form. FDM is the most widely used 3D Printing technology: it represents the largest installed base of 3D printers globally and is often the first technology people are exposed to. In this article, the basic principles and the key aspects of the technology are presented.<br />
<img src="img/week_05/Picture01.jpg" class="img-responsive" alt="..."><br />
② Stereolithography (SLA)<br />
Stereolithography is an additive manufacturing process that belongs to the Vat Photopolymerization family. In SLA, an object is created by selectively curing a polymer resin layer-by-layer using an ultraviolet (UV) laser beam. The materials used in SLA are photosensitive thermoset polymers that come in a liquid form. SLA is famous for being the first 3D Printing technology: its inventor patented the technology back in 1986. If parts of very high accuracy or smooth surface finish are needed, SLA is the most cost-effective 3D printing technology available. Best results are achieved when the designer takes advantage of the benefits and limitations of the manufacturing process.<br />
<img src="img/week_05/Picture02.jpg" class="img-responsive" alt="..."><br />
</p>
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<h4><strong>Test File</strong></h4>
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<p>
①A test on <a href="https://www.thingiverse.com/thing:704409">thingiverse</a><br />
<li>
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<strong>size:</strong> <em>the object is 14x50x50mm (baseplate);</em>
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<strong>hole size</strong> <em>3 holes (3/4/5mm);</em>
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<strong>Nut size:</strong> <em>M4 Nut should fit perfectly;</em>
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<strong>fine details:</strong> <em>pyramide, cone, all numbers;</em>
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<strong>rounded print:</strong> <em>wave, half sphere;</em>
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<strong>minimum distance between walls:</strong> <em>0.1/0.2/0.3/0.4/0.5mm;</em>
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<strong>overhang:</strong> <em>25°/30°/35°/40°/45°;</em>
</li>
<li>
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<strong>bridge print:</strong> <em>2/3/4/5/6/7/8/9mm;</em>
</li>
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<strong>surface:</strong> <em>all the flat parts.</em>
</li>
<img src="img/week_05/Picture03.jpg" class="img-responsive" alt="..."><br />
② <a href="https://www.thingiverse.com/thing:3158705">Torture test</a> by Autodesk research scientist Andreas Bastian<br />
Tests a printer’s dimensional accuracy, resolution, and alignment. For example, poor execution of the “bridging” feature shown below will lead to a saggy and stringy print. A well-calibrated printer will make the horizontal feature with fewer of those issues.<br />
<img src="img/week_05/Picture04.jpg" class="img-responsive" alt="..."><br />
</p>
<div class="text-center">
<div class="section-title center" >
<h4><strong>Setting in Software of Cura</strong></h4>
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<p>
① A test on thingiverse<br />
Layer height: 0.2mm, Wall line count:0.8mm, Top layers:0.8mm, Bottom layers:0.8mm, Infill: 80%, Speed: 60mm/s, Nozzle temp: 210℃, Bed temp: 45℃, Material: 1.75mm PLA, Nozzle diameter: 0.4mm, Support type: extend to platform.<br />
<img src="img/week_05/Picture05.jpg" class="img-responsive" alt="..."><br />
<img src="img/week_05/Picture06.jpg" class="img-responsive" alt="..."><br />
② Torture test<br />
Layer height: 0.2mm, Wall line count:0.8mm, Top layers:0.8mm, Bottom layers:0.8mm, Infill: 20%, Speed: 60mm/s, Nozzle temp: 210℃, Bed temp: 45℃, Material: 1.75mm PLA, Nozzle diameter: 0.4mm, Support type: extend to platform.<br />
<img src="img/week_05/Picture07.jpg" class="img-responsive" alt="..."><br />
<img src="img/week_05/Picture08.jpg" class="img-responsive" alt="..."><br />
</p>
<div class="text-center">
<div class="section-title center" >
<h4><strong>Printer Description</strong></h4>
</div>
</div>
<p>3D printer FDM D420: Area (x, y, z): D100mm*270mm, how to print: SD card, Nozzle diameter:0.4mm, Filament diameter: 1.75mm, Axis movement: Delta.</p>
<img src="img/week_05/Picture09.jpg" class="img-responsive" alt="..."><br />
<img src="img/week_05/Picture10.jpg" class="img-responsive" alt="..."><br />
<div class="text-center">
<div class="section-title center" >
<h4><strong>Print Tests</strong></h4>
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</div>
<p>① A test on thingiverse</p>
<img src="img/week_05/Picture11.jpg" class="img-responsive" alt="..."><br />
<img src="img/week_05/Picture12.jpg" class="img-responsive" alt="..."><br />
<img src="img/week_05/Picture13.jpg" class="img-responsive" alt="..."><br />
<p>② Torture test</p>
<img src="img/week_05/Picture14.jpg" class="img-responsive" alt="..."><br />
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Address: No.10, Kehua street, Wuhou District, Chengdu, Sichuan Province, China<br />
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