<p>I have noticed that <a href="http://slic3r.org/" rel="noreferrer">Slic3r</a> offers a speed setting called "<a href="http://slic3r.org/blog/new-stable-1.2.9" rel="noreferrer">auto speed</a>" meant to give a constant filament pressure at the extruder, which I believe could eliminate filament grinding issues at higher printing speeds. </p>

<p>According to the tooltip in Slic3r, auto speed is calculated from two parameters:</p>

<ul>
<li>Maximum speed</li>
<li>Maximum volumetric speed</li>
</ul>

<p>Maximum speed speaks for itself, but how can I calculate the maximum volumetric speed of my print?</p>

[{'answer_id': 247, 'author': 'Ian Williams', 'author_id': 196, 'author_profile': 'https://3dprinting.stackexchange.com/users/196', 'pm_score': 4, 'selected': True, 'text': '<p>Auto speed is calculated from maximum volumetric speed in mm<sup>3</sup> per second. If you normally print at 80 mm/s, your extrusion width is 0.5 mm and you are printing 0.2mm high layers, your volumetric speed would be 80 * 0.5 * 0.2 = 8 mm<sup>3</sup>/s, which is the volume of plastic extruded by your printer every second when printing at that speed (not accounting for any die swell).</p>\n'}, {'answer_id': 5890, 'author': '4levels', 'author_id': 10632, 'author_profile': 'https://3dprinting.stackexchange.com/users/10632', 'pm_score': 2, 'selected': False, 'text': '<p>There\'s no fixed maximum volumetric speed that works for everyone, there\'s simply too much variables to account for.\nBy using @Ian Williams explanation you can convert from volumetric to regular speeds but you still need to test what speed works best for your setup.</p>\n\n<p>Just a few of the other variables affecting how fast material can come out consistently: temperature (nozzle &amp; heat brake), extruder motor power, path friction between extruder and hotend, material compressibility, fluidity and glass transition temperature, ..</p>\n\n<p>There are interesting topics on RepRap forums, like this one: </p>\n\n<p><a href="http://forums.reprap.org/read.php?262,654085" rel="nofollow noreferrer">http://forums.reprap.org/read.php?262,654085</a></p>\n'}]
['https://3dprinting.stackexchange.com/questions/203', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/115/']