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No one likes using supports so it is essential to know the limitations of your
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Summary
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<header class="post-full-header">
<section class="post-full-meta">
<time class="post-full-meta-date" datetime="2018-08-09"
>9 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: Overhang Test
</h1>
</header>
<figure class="post-full-image">
<img
srcset="
../content/images/size/w300/2018/08/coverPhoto.png 300w,
../content/images/size/w600/2018/08/coverPhoto.png 600w,
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"
sizes="(max-width: 800px) 400px,
(max-width: 1170px) 700px,
1400px"
src="../content/images/size/w2000/2018/08/coverPhoto.png"
alt="Yet Another Test Suite: Overhang Test"
/>
</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>
<p>
<a href="../yet-another-test-suite/"
>Find a full write up and other tests on my blog</a
>
</p>
<h2 id="summary">Summary</h2>
<p>
No one likes using supports so it is essential to know the
limitations of your printer so you can use a minimal amount of
support and still get great looking models. This model tests 3
different kinds of overhangs in one. It tests concave, convex,
and flat surfaces so you can see how your printer is able to
do each one. Generally, concave overhangs print better than
convex so this print is great for visualizing this. The idea
behind this is that printing outside of parametric models
usually has very weird shapes which normal flat tests don't
test for.
</p>
<p>
<em
>This model is fully parameterized if you have Inventor.</em
>
</p>
<iframe
id="vs_iframe"
src="https://www.viewstl.com/?embedded&shading=flat&rotation=yes&clean=yes&noborder=yes&edges=no&bgcolor=transparent"
style="border: 0; margin: 0; width: 100%; height: 100%"
></iframe>
<h2 id="projectcontents">Project Contents</h2>
<p>
This project contains a .stl and a .ipt Inventor file. By
default, the .stl is pretty small and should be printable in
under 45 minutes. If you want to print it larger to make any
issues more prevalent then you should easily be able to scale
the model in your slicer without any issues. The model also
has a small notch on the back at the 50-degree mark, this is
so it's easy to tell when your at this point because this is
where most printers begin running into issues with overhangs.
</p>
<p>
<img
src="../content/images/2018/08/inventorPreview-1.png#full"
alt="inventorPreview-1"
/><br />
<img
src="../content/images/2018/08/modelProfile.png#full"
alt="modelProfile"
/>
</p>
<p style="text-align: center; font-style: italic">
Preview of the file in Inventor
</p>
<h2 id="goalsofthisprint">Goals of This Print</h2>
<p>
This print is designed to be small, fast, and easily readable
to make it easy as possible for you to troubleshoot overhang
issues.
<em
><a href="../yet-another-test-suite-bridging-test/"
>If you're having extreme overhang issues I would
recommend starting with my Bridge Test.</a
></em
>
Bridging and Overhangs are highly correlated, but getting
beautiful overhangs takes more fine tuning than successful
bridges.
</p>
<p>
This test is a profile with 2 arcs and a flat surface that is
lofted up at increasing angles until you end up parallel with
the ground. The reasonable expectation of any printer is that
it is able to print perfectly until about 45 to 50 degrees
before it runs into issues. The model has a small notch on the
back to indicate when you go to 50 degrees, so if you have any
issues before this point then your issue isn't Overhang,
<a href="../yet-another-test-suite/"
>its something else that I probably have a guide on.</a
>
Its hard to capture in pictures with my black filament, but
the changes in degrees are pretty easy to see with the print
in your hands. each change is 10 degrees down until you get to
zero (parallel with the ground).
</p>
<p>
<img
src="../content/images/2018/08/underView1.jpg#full"
alt="underView1"
/>
</p>
<p style="text-align: center; font-style: italic">
You can see the print having worse issues as the print angle
gets more agressive
</p>
<h3 id="eliminatingoverhangs">Eliminating Overhangs</h3>
<p>
It is important to note that for most prints the best way to
fix overhangs is to not have them at all. Usually rotating a
model, or adding a chamfer or fillet can decrease an angle
making your print easier for your printer, while saving
filament, and in some cases actually making your print
stronger.
</p>
<h3 id="speed">Speed</h3>
<p>
Slowing your printer down means that the filament has more
time to cool down where it was placed, and not drag or fall.
Printers can have vastly different speeds so it's important to
search online for numbers that make sense for you, then slowly
change them from there.
</p>
<h3 id="temperature">Temperature</h3>
<p>
Overhangs print more and more material over thin air as the
angle decreases. 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>
<hr />
<h2 id="printsettings">Print Settings</h2>
<h3 id="rafts">Rafts</h3>
<p>
This print should be just fine without a raft. If you are
having problems with the print not sticking to the bed then I
would look up guides on troubleshooting that.
</p>
<h3 id="resolution">Resolution</h3>
<p>
Whatever you usually print at. Smaller layer height should
make overhangs turn out better.
</p>
<h3 id="infill">Infill</h3>
<p>
At the default size you shouldn't need any infill, but if you
scale it up then I would recommend using your normal infill
for prints just to keep as many variables the same as you can.
I generally stick to around 15%
</p>
<h2 id="download">Download</h2>
<p>
<a href="https://www.thingiverse.com/thing:3042444"
>View this Project on my Thingiverse</a
>
</p>
<p>
<a href="https://bit.ly/OverhangTest"
>View this Project on my GitLab</a
>
</p>
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Yet Another Test Suite: Overhang Test
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