<p>I've got a Renkforce RF1000 which should be a good 3D printer. I got it second-hand for my birthday one year ago. I've got no way of contacting the old owner.</p>
<p>I spend a good amount of hours fine-tuning the slicer settings last year but at best got mediocre prints. Between September and a week ago I lived somewhere else and didn't touch my printer.</p>
<p>Now here's what I don't know:</p>
<ul>
<li>I don't know what parts are replaced</li>
<li>I don't know what my nozzle size is</li>
<li>I don't know if the limit switches are calibrated correctly
<ul>
<li>Though I think they are. This doesn't seem to be a problem. I did re-calibrate the Z-axis</li>
</ul>
</li>
</ul>
<p>Here are some important details:</p>
<ul>
<li>I use 3 mm Renkforce PLA filament which I print at 190 °C on a bed heated at 60 °C. The PLA is over one year old now.</li>
<li>There's a fan on the motor on top that isn't connected to anything.</li>
</ul>
<p>Here are some of the problems I've got:</p>
<ul>
<li>I've had multiple prints failing due to the extruder not working properly. The motor keeps on spinning but the &quot;feed knurl&quot; remains stationary</li>
<li>I can't seem to get the right extraction settings</li>
<li>I can't seem to get my prints to consistently stick. It tends to work when I heat the bed to 60 °C and use glue and get lucky.</li>
</ul>
<p>Feel free to give any thoughts you've got. These are the most important questions I've got:</p>
<ol>
<li>Should I replace the nozzle with <a href="https://www.conrad.com/p/renkforce-nozzle-v2-03-mm-suitable-for-3d-printer-renkforce-rf1000-renkforce-rf2000-1296238?searchTerm=renkforce%20nozzle&amp;searchType=suggest&amp;searchSuggest=product" rel="nofollow noreferrer">this one</a> so that I know what nozzle I've got and so I'm sure this isn't a problem?</li>
<li>Should I replace the filament with new 1.75 mm PLA? If so, why?</li>
<li>How do I fix the extruder?</li>
</ol>
<ul>
<li>I tried getting the &quot;feed knurl&quot; off but can't seem to do this easily. I've got some super glue I could try to put in there but something's telling me this might be a very bad idea...</li>
</ul>
<ol start="4">
<li>Is the unconnected fan important and if so: what do I do with it? There's no remaining wire to connect it to.</li>
<li>How tight should the 4 screws that hold the filament between the extruder and the rolling disk be?</li>
</ol>
<p>For now, these are all hardware problems. I can post my Slic3r settings too but I believe the hardware should be fixed before going into slicer settings.</p>
<p>Here are some pictures showing the problems:</p>
<p><a href="https://i.stack.imgur.com/ynZ9v.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ynZ9v.jpg" alt="Top image one" /></a></p>
<p>This is the extruder. The feeding mechanism can be seen in front. It shows the &quot;feed knurl&quot; of which the inside spins while the outside remains stationary (question 3). Next to it are 4 screws which determine how tight the filament is held against the extruder (question 5). On the back it shows a black fan, this got placed by the previous owner but isn't connected (question 4).</p>
<p><a href="https://i.stack.imgur.com/Cu0UM.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Cu0UM.jpg" alt="Image unconnected fan with unscrewed extruder" /></a></p>
<p>This image shows the unconnected fan (question 4) to the right. Behind it is the motor that's connected to the extruder. The motor works but the extruder doesn't spin with it. The extruder has a little black hole on top.</p>
<p><a href="https://i.stack.imgur.com/WyWj2.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WyWj2.jpg" alt="Front view extruder" /></a></p>
<p>This shows the extruder from the front. The inner layer spins, the outer layer doesn't (question 3)</p>
<p><a href="https://i.stack.imgur.com/yZd1o.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/yZd1o.jpg" alt="Failed print example" /></a></p>
<p>These are some of the prints when the extruder was still working.</p>
<p><a href="https://i.stack.imgur.com/zdToY.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zdToY.jpg" alt="Nozzle and print bed" /></a></p>
<p>Nozzle and print bed (question 1)</p>

[{'answer_id': 13500, 'author': 'Mohamed', 'author_id': 20715, 'author_profile': 'https://3dprinting.stackexchange.com/users/20715', 'pm_score': 0, 'selected': False, 'text': '<p>The reason for this sort of error might be either \n1) a clogged nozzel, <a href="https://www.youtube.com/watch?v=bg4sOaSvimY" rel="nofollow noreferrer">try doing this </a>\n2) disturbed bed level,<a href="https://www.youtube.com/watch?v=lL3Gmy4hh3Y" rel="nofollow noreferrer">resolve this issue </a>\n3) poor filament quality,</p>\n'}, {'answer_id': 13502, 'author': 'fred_dot_u', 'author_id': 854, 'author_profile': 'https://3dprinting.stackexchange.com/users/854', 'pm_score': 4, 'selected': True, 'text': "<p>One hundred percent infill is not necessarily stronger than lower values. By having such a high infill figure, the forces on the model as it cools are magnified and not in a particularly good manner.</p>\n\n<p>Consider that you could use twenty to thirty percent infill to get the strength you require for this application, saving filament and time for the print. You've not noted how many wall layers used, but for increased strength, four to five would make for a very strong model.</p>\n"}]
['https://3dprinting.stackexchange.com/questions/13503', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/14693/']