<p>Divide the amount overextruded by the desired amount. If you wanted 100mm but got 101mm, that's 1mm extra, or 1% over. Use an extrusion multiplier of 0.99 (1% under) to compensate - AND THEN DO ANOTHER TEST to confirm.</p>

<p>This modifier will be used by Slic3r to generate E values in your gcode without flashing anything. </p>

<p>I recommend saving this recipe with an intuitive name, like <em>Acme Green PLA.</em></p>

CC BY-SA 4.0
2018-08-21T20:04:08.910Z
2018-08-21T20:04:08.910Z
Davo
<p>Most tutorials ask you to change the printer settings using the <code>The command M92 E420 will set the new value which can be saved to memory (so that it is available after a printer power off/on cycle) using M500.</code></p>

<p>But I just want to modify the Extrusion Multiplier in Slic3r's settings. It's default at for each filament, and I'd like to modify this by adding a profile for each roll I have after calibration.</p>

<p><a href="https://i.sstatic.net/5kIPm.png" rel="noreferrer"><img src="https://i.sstatic.net/5kIPm.png" alt="enter image description here"></a></p>

<p>What's the best way to do this? If I measure extruding 100mm and checking how much is left, what is the formula used to get the new EM value?</p>

<prusa-i3><calibration><extrusion>
How can you calibrate extrusion multiplier value in Slic3r WITHOUT changing printer settings in memory?
NLed
# How can you calibrate extrusion multiplier value in Slic3r WITHOUT changing printer settings in memory?

(Asked by: username_0 on 2018-08-21)

Most tutorials ask you to change the printer settings using the `The command M92 E420 will set the new value which can be saved to memory (so that it is available after a printer power off/on cycle) using M500.`

But I just want to modify the Extrusion Multiplier in Slic3r's settings. It's default at for each filament, and I'd like to modify this by adding a profile for each roll I have after calibration.

[![enter image description here](https://i.sstatic.net/5kIPm.png)](https://i.sstatic.net/5kIPm.png)

What's the best way to do this? If I measure extruding 100mm and checking how much is left, what is the formula used to get the new EM value?

**Tags:** prusa-i3, calibration, extrusion

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## 1 answers

### Answer by username_1 on 2018-08-21. Score: 6 | Accepted answer

Divide the amount overextruded by the desired amount. If you wanted 100mm but got 101mm, that's 1mm extra, or 1% over. Use an extrusion multiplier of 0.99 (1% under) to compensate - AND THEN DO ANOTHER TEST to confirm.

This modifier will be used by Slic3r to generate E values in your gcode without flashing anything.

I recommend saving this recipe with an intuitive name, like *Acme Green PLA.*


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