<p>I'm printing a ring that's a replacement for the non-slip base of a mixing bowl. The ring is about 130mm in diameter, with a rectangular cross section, like this:</p>
<p><a href="https://i.stack.imgur.com/9cx9Y.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9cx9Y.png" alt="rubber ring" /></a></p>
<p>I'm using Cura as the slicer, and I've set the infill to 100% and <code>concentric</code>, but after slicing it looks like Cura used <code>lines</code> instead; the ring is filled with parallel straight lines:</p>
<p><a href="https://i.stack.imgur.com/LEfXF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/LEfXF.png" alt="lines infill" /></a></p>
<p>Is this a problem with Cura? Is there something I can do to encourage it to use concentric infill? I don't really care what the infill pattern is, but I think <code>concentric</code> would print a lot faster since the head wouldn't have to switch directions all the time.</p>

[{'answer_id': 19742, 'author': 'Caleb', 'author_id': 1690, 'author_profile': 'https://3dprinting.stackexchange.com/users/1690', 'pm_score': 2, 'selected': False, 'text': "<blockquote>\n<p>Is this a problem with Cura?</p>\n</blockquote>\n<p>I don't know if the good folks at Ultimaker consider this a bug or a feature, but it appears that Cura uses the <code>Lines</code> option regardless of the <em>Infill Pattern</em> setting when <em>Infill Density</em> is set to <code>100%</code>. There may well be some reason for that; for example, the fact that the <code>Lines</code> option alternates the direction of the lines from one layer to the next probably makes for stronger parts.</p>\n<blockquote>\n<p>Is there something I can do to encourage it to use concentric infill?</p>\n</blockquote>\n<p><strong>Yes!</strong> It turns out that setting <em>Infill Density</em> to anything less than <code>100%</code> gives the expected concentric infill (provided <em>Infill Pattern</em> is set to <code>Concentric</code>, of course). When I changed the setting to <code>99.99%</code> and re-sliced, I got concentric infill in the Preview panel. I haven't tried printing yet, but I have no doubt that I'll get the same thing in the actual print.</p>\n<blockquote>\n<p>I don't really care what the infill pattern is, but I think concentric would print a lot faster</p>\n</blockquote>\n<p>With <em>Infill Density</em> set to <code>99.99%</code> and <em>Infill Pattern</em> set to <code>Concentric</code>, the estimated time to print my part drops from 4 hours 50 minutes to 2 hours 44 minutes, <strong>a 44% time savings compared to 100% infill</strong>. That's probably a lot more savings than you'd get on a part that wasn't so narrow, but it's worth knowing that at least some parts can print much faster with concentric infill.</p>\n"}, {'answer_id': 19743, 'author': 'R.. GitHub STOP HELPING ICE', 'author_id': 11157, 'author_profile': 'https://3dprinting.stackexchange.com/users/11157', 'pm_score': 3, 'selected': True, 'text': '<p>This is <a href="https://github.com/Ultimaker/Cura/issues/11568" rel="nofollow noreferrer">a known issue</a>. Cura\'s profile variable logic sets the number of bottom layers to 999999 if infill is set to 100%, overriding infill by replacing it with additional bottom layers. If you go find the setting for number of bottom layers and set it back to the number you actually want, overriding this, infill should work as expected.</p>\n<p>Alternatively, setting top/bottom pattern to concentric should also fix it, and you probably want that anyway so that you don\'t have distinct bottom layers that are printed as lines.</p>\n'}]
['https://3dprinting.stackexchange.com/questions/19740', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/1690/']