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<time class="post-full-meta-date" datetime="2018-08-06"
>6 August 2018</time
>
<span class="date-divider">/</span>
<a href="../tag/yet-another-test-suite/"
>Yet Another Test Suite</a
>
</section>
<h1 class="post-full-title">
Yet Another Test Suite: Bridging Test
</h1>
</header>
<figure class="post-full-image">
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srcset="
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</figure>
<section class="post-full-content">
<div class="post-content">
<p>
<em
>This is the beginning of a larger suite of test prints I am
developing that can be used to calibrate your 3D printer
cheaply, and quickly.</em
>
</p>
<h2 id="summary">Summary</h2>
<p>
The two major factors that come into play when printing a good
bridge are <strong>Temperature</strong> and
<strong>Print Speed</strong>. The lower both of these
respective values are the better your bridges are likely to
succeed. The goal of this project is that its a test that
prints very fast, the full test should print in under 45
minutes.
</p>
<p>This model is fully parameterized if you have Inventor.</p>
<h2 id="contents">Contents</h2>
<p>
This project contains two .stl files that are ready to be
sliced and printed. bridgeTest.stl is a complete test with 4
different lengths. oneBridge.stl contains only the longest of
the bridges at 25mm. The other files is bridgeTest.ipt this is
a parameterized inventor file for changing the parameters of
the test for anyone who wishes to do that, but I think the
default setup is good.
</p>
<h2 id="goalsofthisprint">Goals of This Print</h2>
<p>
This print is designed to be fast to help you troubleshoot any
issues your printer may encounter as your bridges increase in
length. By default, the bridge spans are 10mm, 15mm, 20mm, and
25 mm. Another thing to note concerning this print is by
default the bridge is 3mm above the print bed. In most cases,
I think this is enough to avoid heat coming off your print bed
to affect the bridge quality but your results may vary and it
is something to consider.
</p>
<p>
From what I've seen, horizontal bridges will never quite match
the quality of a normal print operation, but you can get
pretty close. You will always have very defined lines, but if
done correctly these should be connected to the print pretty
well and shouldn't be an issue outside of being a slight
eyesore on some prints.
</p>
<h3 id="speed">Speed</h3>
<p>
If your speed is off it will be very obvious. Over extrusion
is going to mean that you have a bridge that may sag lower
than it should, meaning any layers above it aren't going to
have anything to support them which will cause structural and
visual issues above the bridge for a few layers before your
printer hopefully recovers.
</p>
<p>
The other issue is under extrusion which in a worst case
scenario means your bridge will break in the middle of the
process leading to a huge mess under the bridge and may cause
even more issues than over extrusion.
</p>
<h3 id="temperature">Temperature</h3>
<p>
The key element in bridging is that your cooling melted
plastic in place while it is suspended in the air. This means
its important to make sure your temperature isn't higher than
its required to be, and that your print head fans are running
at full to ensure the filament hardens as quickly as possible
once it leaves the print head.
</p>
<h3 id="goodbridging">Good Bridging</h3>
<p>
<img
src="../content/images/2018/08/goodBridging.jpg#full"
alt="Example of Good 3D Printing Bridging"
/>
</p>
<h3 id="poorbridging">Poor Bridging</h3>
<p>
<img
src="../content/images/2018/08/poorBridging.jpg#full"
alt="Example of Poor 3D Printing Bridging"
/>
</p>
<hr />
<h2 id="printsettings">Print Settings</h2>
<h3 id="rafts">Rafts</h3>
<p>
I didn't use any, but if you're having issues with the print
not sticking since it does have a very small surface area on
the bed, or if your having an issue with the bed giving off
too much heat I would imagine that a raft would help.
</p>
<h3 id="supports">Supports</h3>
<p>
Definitely defeats the purpose of this print unless you're
testing your support settings.
</p>
<h3 id="resolution">Resolution</h3>
<p>0.40 mm</p>
<h3 id="infill">Infill</h3>
<p>
I would do something low like 10%-15%, more importantly, I
would do 3+ exterior shells to ensure you are seeing how the
bridge works with more layers on it.
</p>
<h2 id="download">Download</h2>
<p>
<a href="https://www.thingiverse.com/thing:3036666"
>View this Project on my Thingiverse</a
>
</p>
<p>
<a href="https://bit.ly/AnsonBridgeTest"
>View this Project on my GitLab</a
>
</p>
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<h4 class="author-card-name">
<a href="../author/anson/">Anson Biggs</a>
</h4>
<p>
I am an undergraduate Aerospace Engineering student with a
focus on Astronautics and a minor in Electronic Engineering
studying at Embry-Riddle Aeronautical University in
Prescott, Arizona.
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Yet Another Test Suite is a suite of tests for calibrating
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