<p>I recently upgraded to a E3D full hotend and I started to have problems with slowly printed parts. After I print first object and start next one, then the first layer has serious issue.</p>

<p><a href="https://i.stack.imgur.com/wSSm4.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wSSm4.jpg" alt="enter image description here"></a></p>

<p>The first two test were extruded around 10mm/s, the right one around 15mm/s. The material is PLA (fillamentum.com) at temperature 210°C and nozzle diameter is 0.4mm. The Rebel II RepRap printer uses RAMPS with marlin firmware. I use Slic3r and Pronterface SW. </p>

<p>I didn't find answer in following troubleshooting guides:</p>

<ul>
<li><a href="https://www.simplify3d.com/support/print-quality-troubleshooting/" rel="nofollow noreferrer">Simplify3D - Print Quality Troubleshooting Guide</a></li>
<li><a href="http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide" rel="nofollow noreferrer">A visual Ultimaker troubleshooting guide</a></li>
<li><a href="http://reprap.org/wiki/Print_Troubleshooting_Pictorial_Guide" rel="nofollow noreferrer">RepRap - Print Troubleshooting Pictorial Guide</a></li>
<li><a href="https://all3dp.com/common-3d-printing-problems-and-their-solutions" rel="nofollow noreferrer">all3dp.com - 16 Common 3D Printing Problems (And Solutions)</a></li>
</ul>

<p>Do you have an idea what can cause this issue?</p>

<h2>Update</h2>

<p>I did a new print, where I just heat the hotend and start printing immediately. This is the result: </p>

<p><a href="https://i.stack.imgur.com/Tqugj.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Tqugj.jpg" alt="enter image description here"></a></p>

[{'answer_id': 1235, 'author': 'fred_dot_u', 'author_id': 854, 'author_profile': 'https://3dprinting.stackexchange.com/users/854', 'pm_score': 3, 'selected': False, 'text': "<p>You may find a solution with the common lubricant containing PTFE, often called Super Lube. It is described in manufacturer's literature as non-reactive with virtually everything. It is available at a reasonable price as plumber's grease (look for either Teflon or PTFE in the ingredients) in various quantity containers. When used on metal, you may get black residue. With plastic, some color of the plastic will appear as the surfaces wear. It has good sticking power too.</p>\n"}, {'answer_id': 1237, 'author': 'darth pixel', 'author_id': 1211, 'author_profile': 'https://3dprinting.stackexchange.com/users/1211', 'pm_score': 4, 'selected': True, 'text': '<p>I use cosmetic vaseline - <a href="https://en.wikipedia.org/wiki/Petroleum_jelly" rel="noreferrer">petroleum jelly</a>. Usually it is white to transparent and odorless. It\'s cheap and available in all drugstores and cosmetics stores.</p>\n\n<p>As suggested by Tom van der Zanden I\'m adding additional info about interactions of vaseline and plastics.\nI\'ve found many web sites which claim that vaseline can damage plastics but none of them really proved that statement. There is nothing about it neither on producers sites nor wikipedia or any other believable sources I\'ve found. So according to it and my practice I\'m pretty sure that vaseline won\'t damage popular plastics (including common filaments).</p>\n\n<p>The only information I\'ve found is that vaseline can damage natural rubber but I cannot confirm that on my own.</p>\n\n<p>Of course it might not be true for some materials so be careful and check the interactions first on invisible side or on refuses.</p>\n'}, {'answer_id': 1238, 'author': 'Tormod Haugene', 'author_id': 115, 'author_profile': 'https://3dprinting.stackexchange.com/users/115', 'pm_score': 2, 'selected': False, 'text': '<p>I have been using <em>sewing machine oil</em> for my 3D printed extruder gear for a couple of years, without any noticeable wear so far.</p>\n\n<p>In general, I believe any kind of low viscosity oil would do, but then again, it also depends on the environment in which you plan to use the model. If you plan on using it outside, for instance, you probably should get some grease that does not attract dirt, as the dirt itself will grind down the gears quickly.</p>\n'}]
['https://3dprinting.stackexchange.com/questions/1239', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/75/']