<p>I am making a "fun button", with a dome-shaped top. The vertical sides, top center, and raised lettering seem fine, but the more sloped outer parts of the dome are very thin, with some gaps and the infill pattern is quite visible. It's almost like the slicer isn't recognizing the sloped part as an exterior shell. </p>

<p>What is causing this, and how can I fix it?</p>

<p><a href="https://i.stack.imgur.com/cU2IR.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cU2IR.jpg" alt="My Fun Button"></a></p>

<p>The model was made in Fusion 360, sliced in Repetier with Slic3r, and printed on a Monoprice Maker Select Mini.</p>

<p>Edit: More information after checking values used and taking more photos.</p>

<p>This was my second attempt, after increasing the shell count already.</p>

<p>On my first print, I clearly had a low value for horizontal shells, top and bottom were both at the default of 3. I upped these  both to 8. (Layer height is 0.13125.)  The bottom of the button is now good. The "good" center area extends a little further out, so I think it's probably thicker up at the top of the dome. But the sloped sides are pretty much the same - this is why I'm thinking it's not being considered as a "horizontal shell".</p>

<p>Comparison:</p>

<p><a href="https://i.stack.imgur.com/6C7aX.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6C7aX.jpg" alt="bottom of buttons"></a></p>

<p><a href="https://i.stack.imgur.com/SgwOd.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SgwOd.jpg" alt="top of buttons"></a></p>

<p>There are some design iterations, but the top surface is the same shape.</p>

<p><strong>Update:</strong></p>

<p>I did a print using Cura, with 0.8 mm shells, and it looks great!</p>

<p><a href="https://i.stack.imgur.com/D4iC5.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/D4iC5.jpg" alt="Printed with Cura"></a></p>

<p>I cut the two bad prints with a hacksaw to see a cross-section. The bottom is clearly thicker. The top on the outer infill void is pretty much the same. The top on the other void is thicker most of the way across, but suddenly changes to thin.</p>

<p><a href="https://i.stack.imgur.com/A27aV.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/A27aV.jpg" alt="Cross section"></a></p>

[{'answer_id': 3462, 'author': 'Davo', 'author_id': 4922, 'author_profile': 'https://3dprinting.stackexchange.com/users/4922', 'pm_score': 2, 'selected': False, 'text': '<p>Slice with more solid top layers. I always use five with low-density infill.</p>\n'}, {'answer_id': 3501, 'author': 'StarWind0', 'author_id': 2146, 'author_profile': 'https://3dprinting.stackexchange.com/users/2146', 'pm_score': 1, 'selected': False, 'text': '<p>You can either increase the shells, or you can increase the infill density. In addition different fill patterns will help. I would do 4 minimum for such a print.</p>\n'}]
['https://3dprinting.stackexchange.com/questions/3461', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/5704/']