How Can I Calculate Volumetric Speed For Slic3r Auto Speed?

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Learn more about Teams How can I calculate volumetric speed for Slic3r auto speed? Ask Question Asked 8 years, 10 months ago Modified 6 years, 3 months ago Viewed 11k times 11 $\begingroup$

I have noticed that Slic3r offers a speed setting called "auto speed" meant to give a constant filament pressure at the extruder, which I believe could eliminate filament grinding issues at higher printing speeds.

According to the tooltip in Slic3r, auto speed is calculated from two parameters:

• Maximum speed
• Maximum volumetric speed

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

• slic3r
• print-preparation

Share Improve this question Follow edited Aug 18, 2018 at 9:41 Trish 22.5k1313 gold badges5151 silver badges104104 bronze badges asked Jan 13, 2016 at 17:57 Tormod HaugeneTormod Haugene 4,02244 gold badges2222 silver badges4040 bronze badges $\endgroup$ Add a comment |

2 Answers 2

Sorted by: Reset to default Highest score (default) Date modified (newest first) Date created (oldest first) 6 $\begingroup$

Auto speed is calculated from maximum volumetric speed in mm3 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 mm3/s, which is the volume of plastic extruded by your printer every second when printing at that speed (not accounting for any die swell).

Share Improve this answer Follow edited Jan 14, 2016 at 23:41 Tormod Haugene 4,02244 gold badges2222 silver badges4040 bronze badges answered Jan 14, 2016 at 17:25 Ian WilliamsIan Williams 12622 bronze badges $\endgroup$ 2

• $\begingroup$ You are right about the terms: I have updated the post to reflect this. I also found a blog post discussing the math in context of extrusion width, for those interested: extrudable.me/2013/11/03/… $\endgroup$ – Tormod Haugene Commented Jan 14, 2016 at 20:36
• $\begingroup$ Technically not an answer... he asked for the maximum one, you gave him how to calculate the "usual one" he already tested. $\endgroup$ – FarO Commented Apr 9, 2018 at 8:53

Add a comment | 2 $\begingroup$

There's no fixed maximum volumetric speed that works for everyone, there's simply too much variables to account for. By 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.

Just a few of the other variables affecting how fast material can come out consistently: temperature (nozzle & heat brake), extruder motor power, path friction between extruder and hotend, material compressibility, fluidity and glass transition temperature, ..

There are interesting topics on RepRap forums, like this one:

http://forums.reprap.org/read.php?262,654085

Share Improve this answer Follow answered Apr 27, 2018 at 18:32 4levels4levels 12133 bronze badges $\endgroup$ Add a comment |

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