<p>The Monoprice Select Mini V2 uses a Bowden style extrusion system. Bowden extruders compress the filament in the tube where the gap between the filament and inner tube diameter allow for the filament to buckle slightly and compress causing a pressure build-up in the hotend. Without retraction this implies that the filament will start to ooze out of the hotend once you stop extruding.</p>

<p>From your settings can be seen that you are using retraction. The question now arises whether you retract enough? Furthermore, this stringing can be reduced by setting the correct settings for e.g. print temperature, retraction, coasting, travel speed. It is up to you to find the correct settings; test print objects like calibration prints (like in the image you showed) help you with finding the correct settings. </p>

<p>Apparently, the retraction you use still allows for some filament to ooze out of the hotend as shown in your image. This means that prior to the travel move there is still some pressure left in the hotend. A parameter that reduced the pressure prior to the travel movement is called "coasting"; basically you define to stop extruding while the head is still completing the printing moves prior to the travel move. It is advised to explore this setting. Other options to investigate further include lowering filament print temperature or increase travel movement.</p>

CC BY-SA 4.0
2018-09-28T06:38:00.540Z
2018-09-28T06:38:00.540Z
0scar
<p>What I ended up doing was using the settings from the cat.gcode that came with the printer. It has a retraction of 10&nbsp;mm specified, which I thought was a bit much, but if it works, it works.</p>

CC BY-SA 4.0
2019-01-24T14:04:40.930Z
If you haven't already, you can tweak the setting and find the minimum distance. 10 mm does seem high, would 8 mm still work? etc...
Lux Claridge
CC BY-SA 4.0
2018-10-08T00:52:13.117Z
2019-01-24T10:07:49.393Z
2019-01-24T10:07:49.393Z
Jordy337
<p>I have a <a href="https://www.monoprice.com/product?c_id=107&amp;cp_id=10724&amp;cs_id=1072403&amp;p_id=21711" rel="nofollow noreferrer">Monoprice Select Mini V2</a> and I’ve recently been having issues with little strings that are thick and sturdy sticking off of models:</p>

<p><a href="https://i.sstatic.net/xUMyH.jpg" rel="nofollow noreferrer" title="Example of stringing"><img src="https://i.sstatic.net/xUMyH.jpg" alt="Example of stringing" title="Example of stringing"></a></p>

<p>I used Ultimaker Cura v3.4.1 to slice this model: <a href="https://www.thingiverse.com/thing:2563909" rel="nofollow noreferrer">Basic Retraction test</a> using <a href="https://hatchbox3d.com/collections/pla/products/3d-pla-1kg1-75-blk" rel="nofollow noreferrer">Hatchbox Black PLA</a> filament</p>

<p>And the following settings:</p>

<ul>
<li>Layer Height: 0.1313 mm</li>
<li>Wall Thickness 1.05 mm</li>
<li>Infill: 22%</li>
<li>Extruder Temp: 200 °C</li>
<li>Bed Temp: 55 °C</li>
<li>Retraction Distance: 4 mm</li>
<li>Retraction Speed: 40 mm/s</li>
<li>Speed: 50 mm/s</li>
<li>Z-Hop When Retracted: Off</li>
<li>Supports: Off</li>
<li>Adhesion: Brim</li>
</ul>

<p>I’d appreciate any advice on how to fix this problem.</p>

<ultimaker-cura><retraction><monoprice-select-mini>
Monoprice Select Mini V2 retraction/stringing problem
Jordy337
# Monoprice Select Mini V2 retraction/stringing problem

(Asked by: username_0 on 2018-09-27)

I have a [Monoprice Select Mini V2](https://www.monoprice.com/product?c_id=107&cp_id=10724&cs_id=1072403&p_id=21711) and I’ve recently been having issues with little strings that are thick and sturdy sticking off of models:

[![Example of stringing](https://i.sstatic.net/xUMyH.jpg "Example of stringing")](https://i.sstatic.net/xUMyH.jpg "Example of stringing")

I used Ultimaker Cura v3.4.1 to slice this model: [Basic Retraction test](https://www.thingiverse.com/thing:2563909) using [Hatchbox Black PLA](https://hatchbox3d.com/collections/pla/products/3d-pla-1kg1-75-blk) filament

And the following settings:

* Layer Height: 0.1313 mm
* Wall Thickness 1.05 mm
* Infill: 22%
* Extruder Temp: 200 °C
* Bed Temp: 55 °C
* Retraction Distance: 4 mm
* Retraction Speed: 40 mm/s
* Speed: 50 mm/s
* Z-Hop When Retracted: Off
* Supports: Off
* Adhesion: Brim

I’d appreciate any advice on how to fix this problem.

**Tags:** ultimaker-cura, retraction, monoprice-select-mini

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## 2 answers

### Answer by username_0 on 2018-10-08. Score: 2 | Accepted answer

What I ended up doing was using the settings from the cat.gcode that came with the printer. It has a retraction of 10 mm specified, which I thought was a bit much, but if it works, it works.

> **Comments:**
> **username_2**: If you haven't already, you can tweak the setting and find the minimum distance. 10 mm does seem high, would 8 mm still work? etc...  

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### Answer by username_1 on 2018-09-28. Score: 5

The Monoprice Select Mini V2 uses a Bowden style extrusion system. Bowden extruders compress the filament in the tube where the gap between the filament and inner tube diameter allow for the filament to buckle slightly and compress causing a pressure build-up in the hotend. Without retraction this implies that the filament will start to ooze out of the hotend once you stop extruding.

From your settings can be seen that you are using retraction. The question now arises whether you retract enough? Furthermore, this stringing can be reduced by setting the correct settings for e.g. print temperature, retraction, coasting, travel speed. It is up to you to find the correct settings; test print objects like calibration prints (like in the image you showed) help you with finding the correct settings.

Apparently, the retraction you use still allows for some filament to ooze out of the hotend as shown in your image. This means that prior to the travel move there is still some pressure left in the hotend. A parameter that reduced the pressure prior to the travel movement is called "coasting"; basically you define to stop extruding while the head is still completing the printing moves prior to the travel move. It is advised to explore this setting. Other options to investigate further include lowering filament print temperature or increase travel movement.


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