<p>For the Ultimaker 2 flow is typically handled on the printer.</p>

<p>You could make a feature request at <a href="https://github.com/Ultimaker/Cura/issues" rel="nofollow noreferrer">github</a> to let Flow be enabled for Ultimaker 2 printers.</p>

<p>As for your problem: that sounds more like a dimensional accuracy problem to me. I suggest setting Horizontal Expansion to -0.15mm.</p>

CC BY-SA 3.0
2017-07-30T10:11:04.343Z
2017-07-30T10:11:04.343Z
Tim Kuipers
<p>Cura 2.4 reports that the (printer-dependant) G-Code mode prevents the "Flow" (extrusion rate adjustment percentage) setting from being available. Why? I am using an Ultimaker 2+. Is a firmware update required?</p>

<p>I know the "Flow" can by dynamically adjusted on the 3D printer (either in materials or while printing).</p>

<p>I am asking because I have small holes (1 mm) that seem to slice fine but get filled so the extrusion probably is not that optimally tuned. I suspected reducing the material rate would improve this but changing it on the printer (97%) did not yield noticable results and below that it looked worse.</p>

CC BY-SA 3.0
2017-04-04T12:03:55.790Z
The Ultimaker / Marlin firmware documentation at https://github.com/Ultimaker/Ultimaker2Marlin states "M221 S- set extrude factor override percentage".
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<ultimaker-cura><extrusion><ultimaker-2>
Flow Settings in Cura 2.4 for Ultimaker 2+ not available (suspected overextrusion filling small holes)
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# Flow Settings in Cura 2.4 for Ultimaker 2+ not available (suspected overextrusion filling small holes)

(Asked by: username_0 on 2017-04-04)

Cura 2.4 reports that the (printer-dependant) G-Code mode prevents the "Flow" (extrusion rate adjustment percentage) setting from being available. Why? I am using an Ultimaker 2+. Is a firmware update required?

I know the "Flow" can by dynamically adjusted on the 3D printer (either in materials or while printing).

I am asking because I have small holes (1 mm) that seem to slice fine but get filled so the extrusion probably is not that optimally tuned. I suspected reducing the material rate would improve this but changing it on the printer (97%) did not yield noticable results and below that it looked worse.

**Tags:** ultimaker-cura, extrusion, ultimaker-2

> **Comments:**
> **username_0**: The Ultimaker / Marlin firmware documentation at https://github.com/Ultimaker/Ultimaker2Marlin states "M221 S- set extrude factor override percentage".  

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## 1 answers

### Answer by username_1 on 2017-07-30. Score: 2

For the Ultimaker 2 flow is typically handled on the printer.

You could make a feature request at [github](https://github.com/Ultimaker/Cura/issues) to let Flow be enabled for Ultimaker 2 printers.

As for your problem: that sounds more like a dimensional accuracy problem to me. I suggest setting Horizontal Expansion to -0.15mm.


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