<p>I didn't have any printer-related problem for the past 6 months, but now all of a sudden my Prusa MK3S stopped extruding during printing.</p>
<p>This is very strange as I can easily load\unload filament and control the step motor via Settings\Move axis\Extruder. When I did so, the filament got extruded normally.</p>
<p>However, when I try to print something or do First Layer Calibration, nothing comes out of the nozzle. I tried changing the Live Z (maybe nozzle too low) and it didn't help. I once managed to extrude <em>something</em> by increasing the temperature and the flow (in the printer's menu) to a ridiculous value of 999. Obviously, this isn't the best way to solve the problem.</p>
<p>Is there an easy way to fix this? I only had this problem yesterday and with some midrange-priced PETG</p>
<p>Edit: I tried different filaments, default slicer profiles, reinstalling slicer (prusa slicer) and drivers. None of these methods really helped.</p>

[{'answer_id': 16589, 'author': 'Perry Webb', 'author_id': 15075, 'author_profile': 'https://3dprinting.stackexchange.com/users/15075', 'pm_score': 1, 'selected': False, 'text': '<ol>\n<li><p>It doesn\'t seem to be heat creep. See <a href="https://3dprinting.stackexchange.com/questions/15629/what-are-ways-to-avoid-heat-creep">What are ways to avoid heat creep?</a></p>\n</li>\n<li><p>Have you measured the actually temperature of the heater block?  You may have a failing sensor (thermistor) or sensor circuitry.  Optically is the best way to measure.  The least expensive way is with multimeters that come with a temperature sensor, such as a thermocouple (lowest cost about $20 U.S.).</p>\n</li>\n</ol>\n'}, {'answer_id': 16607, 'author': 'StLuke5', 'author_id': 16798, 'author_profile': 'https://3dprinting.stackexchange.com/users/16798', 'pm_score': 0, 'selected': False, 'text': "<p>As it turned out, rebuilding the extruder actually helped. I took it apart to the point where both fans were loose as well as the extruder motor and the hotend. I didn't find anything wrong after a quick look so I put it all back together.</p>\n<p>Then i ran the first layer calibration and for some reason it worked. I know it's neither the most satisfying solution, nor the most informative one, so sorry about that. Either way, thank you for the suggestions, I still have no idea what caused the problem.</p>\n<p>That being said, I hypothesize that something was wrong with the hotend. That is because when I had this probem, molten filament wouldn't exit the heated nozzle on its own. Now when I heat up the hotend, the filament comes out (without the motor working)</p>\n"}, {'answer_id': 18741, 'author': 'user32677', 'author_id': 32677, 'author_profile': 'https://3dprinting.stackexchange.com/users/32677', 'pm_score': 0, 'selected': False, 'text': "<p>I have the exact same issue.  I still haven't figured out what is going on, but my next step is to work backwards.</p>\n<p>I brought my machine in for repairs at our local shop, and the end result was &quot;heat creep&quot; .  It worked for a few prints, then stopped.  It jammed on me and in the process of removing the jam, I broke the leads to the heat block.  When I decide to go back in, I will see if when I reassembled the extruder, I knocked off enough thermal paste to make a difference...  :(</p>\n"}]
['https://3dprinting.stackexchange.com/questions/16586', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/16798/']