<p>Prusa MK3 heatbed power cable shorted out (on the Einsy side) and it looks like I need to replace the Einsy. Should I replace the heatbed too? I don’t know electronics well and am worried I will just fry a new Einsy.</p>
<p>Heatbed end:
<a href="https://i.stack.imgur.com/1pA7t.jpg" rel="nofollow noreferrer" title="Heatbed end"><img src="https://i.stack.imgur.com/1pA7t.jpg" alt="Heatbed end" title="Heatbed end" /></a></p>
<p>Crispy at RAMBo end:
<a href="https://i.stack.imgur.com/rWn8V.jpg" rel="nofollow noreferrer" title="Crispy at RAMBo end"><img src="https://i.stack.imgur.com/rWn8V.jpg" alt="Crispy at RAMBo end" title="Crispy at RAMBo end" /></a></p>
<p>Crispy at RAMBo end:
<a href="https://i.stack.imgur.com/4Ot8Z.jpg" rel="nofollow noreferrer" title="Crispy at RAMBo end"><img src="https://i.stack.imgur.com/4Ot8Z.jpg" alt="Crispy at RAMBo end" title="Crispy at RAMBo end" /></a></p>
<p>Larger images can be found <a href="https://imgur.com/gallery/sAL61ux" rel="nofollow noreferrer">here</a>.</p>

[{'answer_id': 15869, 'author': 'fred_dot_u', 'author_id': 854, 'author_profile': 'https://3dprinting.stackexchange.com/users/854', 'pm_score': 3, 'selected': False, 'text': '<p>It\'s common for modeling software to flip normals, causing what you describe. You said,</p>\n<blockquote>\n<p>I only care about the externally facing faces.</p>\n</blockquote>\n<p>But are you sure they are truly externally facing? Turn on normals in Blender and ensure that all the arrows/pointers are external.</p>\n<p>Another problem that can generate the results you\'re seeing are self-intersecting surfaces, non-manifold edges, and a couple others that are explained in a <a href="https://www.3dhubs.com/knowledge-base/fixing-most-common-stl-file-errors/" rel="nofollow noreferrer">3dhubs article.</a> Correcting those problems involve a bit more examination and trouble shooting.</p>\n<p>The slicing software prefers to have clean, well defined triangular surfaces in order to create a print file. When something is amiss, you get results you\'ve presented.</p>\n<p>With the STL in hand, I opened it in Meshmixer (free) and immediately was given a clue.</p>\n<p><a href="https://i.stack.imgur.com/oITba.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/oITba.png" alt="STL image in meshmixer" /></a></p>\n<p>The zebra-stripes are reversed normals.</p>\n<p>Here\'s another error point, difficult to see clearly in flat 2D image, but panning and zooming and orbiting and all those 3D manipulating things shows there\'s nothing there:</p>\n<p><a href="https://i.stack.imgur.com/FrtCK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/FrtCK.png" alt="broken corner" /></a></p>\n<p>The other end of this not-joined area shows a bit better:</p>\n<p><a href="https://i.stack.imgur.com/IH41m.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IH41m.png" alt="other broken corner" /></a></p>\n<p>After selecting all I could find/locate, I did the reverse normals and here\'s a slightly improved result:</p>\n<p><a href="https://i.stack.imgur.com/GcpRG.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GcpRG.png" alt="corrected part" /></a></p>\n<p>Unfortunately, the other borked up portions prevented meshmixer from performing a suitable auto-repair, completely destroying the model in the process.</p>\n<p>Those joint corners and any other colored lines have to be addressed individually.</p>\n'}, {'answer_id': 15871, 'author': 'Arend', 'author_id': 27354, 'author_profile': 'https://3dprinting.stackexchange.com/users/27354', 'pm_score': 3, 'selected': False, 'text': '<p>Rhino gives the following output for <code>MeshRepair</code></p>\n<ul>\n<li>Mesh has 3 degenerate faces. (a face that\'s actually a line or a point)</li>\n<li>Mesh has 42 non manifold edges. (a line where 3 or more faces meet, possibly caused by degenerate faces)</li>\n<li>Mesh has 6 duplicate faces. (faces that share the same coordinates)</li>\n<li>Mesh has 148 naked edges (edges that have only one face)</li>\n</ul>\n<p>All of these things are indicators that it might be difficult to distinguish inside from outside.</p>\n<p><a href="https://i.stack.imgur.com/x89lO.png" rel="noreferrer"><img src="https://i.stack.imgur.com/x89lO.png" alt="Naked edges" /></a></p>\n<p>I have encountered these problems after changing a model a lot during it\'s lifetime (adding/removing stuff). Since there are 200 errors and it\'s a relatively simple model, I advice you to fix these kind of problems by starting with a new clean model, using some of the coordinates of the old model as reference.</p>\n<p>Also: be sure to check out <a href="https://daler.github.io/blender-for-3d-printing/printing/3d-print-toolbox.html" rel="noreferrer">blender\'s 3d printing wiki</a>, they seem to have quite some tools similar to rhino\'s meshrepair</p>\n'}, {'answer_id': 15880, 'author': 'techset', 'author_id': 27353, 'author_profile': 'https://3dprinting.stackexchange.com/users/27353', 'pm_score': 2, 'selected': False, 'text': "<p>Okay, so like suggested I put it into 3D Builder (A free Windows 3D modeling program). I imported it as an stl, then exported it as an stl and imported that stl into Cura. And lo and behold all problems were gone! If you are having a similar issue give that a try! The 3D Builder program and similar ones are designed to export for the sole purpose of 3D printing so it automatically fixes these issues! If this doesn't work try editing yours in edit mode (Blender) a bit so it makes it easier for 3D Builder to fix it.</p>\n"}, {'answer_id': 15881, 'author': 'Trish', 'author_id': 8884, 'author_profile': 'https://3dprinting.stackexchange.com/users/8884', 'pm_score': 3, 'selected': False, 'text': '<p>There are several problems at work here:</p>\n<ul>\n<li>Internal Geometry &amp; unjoined parts</li>\n</ul>\n<p><a href="https://i.stack.imgur.com/CiNMC.png" rel="noreferrer"><img src="https://i.stack.imgur.com/CiNMC.png" alt="enter image description here" /></a></p>\n<ul>\n<li>Missing Surfaces</li>\n</ul>\n<p><a href="https://i.stack.imgur.com/828Da.png" rel="noreferrer"><img src="https://i.stack.imgur.com/828Da.png" alt="enter image description here" /></a></p>\n<ul>\n<li>Generally inverted surfaces: every surface is inside out!</li>\n</ul>\n<p><a href="https://i.stack.imgur.com/l6wUG.png" rel="noreferrer"><img src="https://i.stack.imgur.com/l6wUG.png" alt="enter image description here" /></a></p>\n<h1>Fixing it!</h1>\n<h2>Step 1: add missing surfaces.</h2>\n<p>Select the vertices around the hole that has no bottom surface and then pres <code>F</code> to create a surface. Use several steps, making roughly triangle surfaces. For example: select the red marked vertices, then <code>F</code> and then the next set.</p>\n<p><a href="https://i.stack.imgur.com/jqM6b.png" rel="noreferrer"><img src="https://i.stack.imgur.com/jqM6b.png" alt="![enter image description here" /></a></p>\n<h2>Step 2: Internal Geometry</h2>\n<p>Let\'s now hunt for purely internal surfaces. Select them and delete them with <code>Del</code>, and select <code>Delete Face</code>.</p>\n<h2>Step 3: Superflous surface geometry</h2>\n<p>Some areas have remnants from areas where you worked. Merge those vertices to prevent new artifacts from cropping up. Select the vertices, <code>M</code> and then <code>collapse</code> for each circle, like the red one. Some might need to be collapsed at a specific vertex to prevent surfaces from getting ripped or intersecting badly - in the lower picture the green circled one.</p>\n<p><a href="https://i.stack.imgur.com/Cs1gV.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Cs1gV.png" alt="enter image description here" /></a></p>\n<h2>Step 4: Normals</h2>\n<p>Last but not least: <code>Alt</code>+<code>N</code> and then <code>Recalculate Outside</code></p>\n<p><a href="https://i.stack.imgur.com/hnHSs.png" rel="noreferrer"><img src="https://i.stack.imgur.com/hnHSs.png" alt="enter image description here" /></a></p>\n<h2>Export to look for other errors...</h2>\n<p>Everything should look much better now: The &quot;checkered&quot; areas are gaps are gaps in the walls... which stem from bad geometry in the big walls I selected in the lower picture.</p>\n<p><a href="https://i.stack.imgur.com/RwOxB.png" rel="noreferrer"><img src="https://i.stack.imgur.com/RwOxB.png" alt="enter image description here" /></a>\n<a href="https://i.stack.imgur.com/w20Qs.png" rel="noreferrer"><img src="https://i.stack.imgur.com/w20Qs.png" alt="enter image description here" /></a></p>\n<p>So, I select one of these areas - then change to vertex mode, deselect the vertex I <strong>don\'t</strong> want the face to connect to (red) but the ones that should define the edge instead (green) and then press <code>F</code> to make a new face. Then I select the old one and delete it.</p>\n<p><a href="https://i.stack.imgur.com/DqpkG.png" rel="noreferrer"><img src="https://i.stack.imgur.com/DqpkG.png" alt="enter image description here" /></a></p>\n<h1>DONE!</h1>\n<p><a href="https://i.stack.imgur.com/Wpwy1.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Wpwy1.png" alt="enter image description here" /></a>\n<a href="https://i.stack.imgur.com/6FRZJ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/6FRZJ.png" alt="enter image description here" /></a></p>\n'}]
['https://3dprinting.stackexchange.com/questions/15873', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/27358/']