<p>Recently started using my kit Prusa I3 Mk3 and noticed that with large horizontal surfaces a wrinkling pattern is emerging.</p>

<p>As you can see in the image the wrinkles seem to run parallel, the surface is 10&nbsp;mm above the build plate with all bridges fully supported.</p>

<p>Has anyone seen this before? All other areas seem to be doing well.</p>

<p>This print uses PLA filament @ 235&nbsp;&deg;C hotend temperature and clearly shows a wrinkled pattern on the top layer</p>

<p><a href="https://i.stack.imgur.com/a8luU.jpg" rel="nofollow noreferrer" title="Print showing wrinkled top layer print issue"><img src="https://i.stack.imgur.com/a8luU.jpg" alt="Print showing wrinkled top layer print issue" title="Print showing wrinkled top layer print issue"></a></p>

<hr>

<p>If it helps, I haven't changed the settings from the normal Prusa Slic3r 0.15 profile.</p>

<p><em>The problem reduced to an acceptable level by reducing the temperature to 205&nbsp;&deg;C but keeping the fan speed 100&nbsp;%, I am printing PLA. I might reduce the fan speed if I feel troubled by the result.</em></p>

[{'answer_id': 8385, 'author': 'Carl Witthoft', 'author_id': 2191, 'author_profile': 'https://3dprinting.stackexchange.com/users/2191', 'pm_score': 2, 'selected': False, 'text': '<p>Might just be that you are bridging without collapsing but still have some visible sag.  Things to try:</p>\n\n<p>1) increase the support/infil density.  If slic3r has a configurable setting like Cura does, you only need to increase the density for the last couple mm prior to the top layer.</p>\n\n<p>2) increase the top plate thickness (number of extruded layers). This often allows the first extruded layer to sag, but the final layer or two to be quite flat. </p>\n'}, {'answer_id': 8408, 'author': '0scar', 'author_id': 5740, 'author_profile': 'https://3dprinting.stackexchange.com/users/5740', 'pm_score': 4, 'selected': True, 'text': '<p><em>Waves in printed surfaces with <a href="https://en.wikipedia.org/wiki/Fused_filament_fabrication" rel="nofollow noreferrer">FFF</a> are observed at either the bottom layer (common) or the top layer (less common).</em></p>\n<h2>Waves in bottom layer</h2>\n<p>Rippling/wave generation/wrinkling is a common problem for first layer to occur and has a direct relation to the print nozzle to bed distance; a too short of a distance or over-extrusion can lead to this effect. However, this effect is less commonly observed in top layer finishes.  Bottom layer waves are described in more detail in <a href="/a/7232">this answer</a>.</p>\n<h2>Waves in top layer</h2>\n<p>I have seen this defect before. It is caused by a <em>combination of incorrect <strong>hotend temperature</strong> and <strong>print cooling fan</strong> settings</em>. Please reduce the hotend temperature and reduce the fan cooling. The image below clearly shows the differences of such measures.</p>\n<p><a href="https://i.stack.imgur.com/10XmG.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/10XmG.jpg" alt="Solving waves in top layer of print" /></a></p>\n'}]
['https://3dprinting.stackexchange.com/questions/8380', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/14687/']