<p>70 °C is a specialty filament. It is well below the <code>MIN_TEMP</code> defined in any sane firmware. In Marlin, you <strong>can't</strong> turn on the extruder in any way, while this is online.</p>
<p>You do need to define your firmware to allow such a print - either by dropping the value in the firmware or disabling Mintemp-protection and then <em>flashing that firmware</em>. That is quite invasive.</p>
<p>To <a href="https://marlinfw.org/docs/gcode/M302.html" rel="nofollow noreferrer">temporarily</a> disable the <code>MIN_TEMP</code>, you need to run the G-code <code>M302 P1</code> or <code>M302 S0</code> - <code>M302</code> on its own does nothing. However, some firmware distributions might explicitly prevent these two commands of <em>turning off</em> the check.</p>
<p>In that case, you might use <code>M302 S65</code> or similar to drop the <code>MIN_TEMP</code>.</p>

CC BY-SA 4.0
2021-01-30T01:16:07.140Z
Thx, i have added the flags too, still nothing. Any thoughts?
Jorge Mercent
CC BY-SA 4.0
2021-01-30T05:47:19.097Z
@JorgeMercent that seems like your firmware bans those two because someone wanted to be smart in writing it. A lower min-Temp is the solution then.
Trish
CC BY-SA 4.0
2021-01-30T19:44:26.920Z
If one's firmware has no override, an alternative solution without flashing might be wiring an additional resistor to fake the output of the thermistor and shift it up to a range the firmware allows printing at. Depending on if you're more comfortable with software or electronics this could be either easier or harder.
R.. GitHub STOP HELPING ICE
CC BY-SA 4.0
2021-01-30T21:37:05.970Z
@R..GitHubSTOPHELPINGICE that's.... tricky and might be dangerous in case you miscalculate: you practically loose temperature control if your resistor is off by half a percent!
Trish
CC BY-SA 4.0
2021-01-29T16:03:29.433Z
2021-01-30T05:46:14.693Z
2021-01-30T05:46:14.693Z
Trish
<p>In Cura Machine Settings, add <code>M302 S70</code>.</p>
<p>Apparently, <code>M302 P1</code> and <code>M302 S0</code> do nothing, you need to define a non-zero minimum, and in my case, 70. Thanks to 0scar and Trish for your help.</p>

CC BY-SA 4.0
2021-01-30T03:52:58.753Z
2021-01-30T05:49:27.263Z
2021-01-30T05:49:27.263Z
Jorge Mercent
<p>I'm using Cura to slice prints from a biodegradable polyester called PCL (<a href="https://en.wikipedia.org/wiki/Polycaprolactone" rel="nofollow noreferrer">Polycaprolactone</a>).</p>
<p>I need to print @ ~70 °C but extruder does not run until nozzle reaches 175 °C.</p>
<p>Which setting to change so extruder will turn on when nozzle temperature has reached 70 °C?</p>
<p>Here are my settings for the material:</p>
<p><strong><a href="https://i.sstatic.net/IIh9C.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/IIh9C.png" alt="strong text" /></a></strong></p>

CC BY-SA 4.0
2021-01-29T14:34:32.637Z
You do not need to use "starting" and "final" printing temperature, only "Printing Temperature" is needed. Can there be a minimum temperature at play here? E.g. usually there are cold extrusion prevention temperatures at play in he firmware, but that doesn't explain that the hot end heats up to 175 °C. Please add the first 30 or so G-code lines.
0scar
CC BY-SA 4.0
2021-01-29T14:43:36.073Z
Hi oscar, i suspect it is the cold extrusion protection. It is using Marlin. The extruder motor will not turn on until at least 175 °C. How do i disable the cold extrusion setting? Or change the minium temperature from Cura? Or doo i have to install firmware with editted configure? Appreciate it!
Jorge Mercent
CC BY-SA 4.0
2021-01-29T16:03:24.037Z
So i looked through the g-code and added in M308 and M17 settings, still nothing. I really have no idea why the extruder is not being turned on. Is there a specific g-code to turn it on? In the code, the e axis is on though
Jorge Mercent
CC BY-SA 4.0
2021-01-29T22:05:29.030Z
Please read the [answer](https://3dprinting.stackexchange.com/a/15497) below to disable it. Cold extrusion prevention was the first thing that came to mind. I wondered why the temperature reached over 170, but that was done by you apparently .
0scar
<hotend><nozzle><temperature>
How to print at low temperatures (filament melting at about 70 °C)?
Jorge Mercent
# How to print at low temperatures (filament melting at about 70 °C)?

(Asked by: username_0 on 2021-01-29)

I'm using Cura to slice prints from a biodegradable polyester called PCL ([Polycaprolactone](https://en.wikipedia.org/wiki/Polycaprolactone)).

I need to print @ ~70 °C but extruder does not run until nozzle reaches 175 °C.

Which setting to change so extruder will turn on when nozzle temperature has reached 70 °C?

Here are my settings for the material:

**[![strong text](https://i.sstatic.net/IIh9C.png)](https://i.sstatic.net/IIh9C.png)**

**Tags:** hotend, nozzle, temperature

> **Comments:**
> **username_1**: You do not need to use "starting" and "final" printing temperature, only "Printing Temperature" is needed. Can there be a minimum temperature at play here? E.g. usually there are cold extrusion prevention temperatures at play in he firmware, but that doesn't explain that the hot end heats up to 175 °C. Please add the first 30 or so G-code lines.  
> **username_0**: Hi oscar, i suspect it is the cold extrusion protection. It is using Marlin. The extruder motor will not turn on until at least 175 °C. How do i disable the cold extrusion setting? Or change the minium temperature from Cura? Or doo i have to install firmware with editted configure? Appreciate it!  
> **username_0**: So i looked through the g-code and added in M308 and M17 settings, still nothing. I really have no idea why the extruder is not being turned on. Is there a specific g-code to turn it on? In the code, the e axis is on though  
> **username_1**: Please read the [answer](https://3dprinting.stackexchange.com/a/15497) below to disable it. Cold extrusion prevention was the first thing that came to mind. I wondered why the temperature reached over 170, but that was done by you apparently .  

---

## 2 answers

### Answer by username_2 on 2021-01-29. Score: 4 | Accepted answer

70 °C is a specialty filament. It is well below the `MIN_TEMP` defined in any sane firmware. In Marlin, you **can't** turn on the extruder in any way, while this is online.

You do need to define your firmware to allow such a print - either by dropping the value in the firmware or disabling Mintemp-protection and then *flashing that firmware*. That is quite invasive.

To [temporarily](https://marlinfw.org/docs/gcode/M302.html) disable the `MIN_TEMP`, you need to run the G-code `M302 P1` or `M302 S0` - `M302` on its own does nothing. However, some firmware distributions might explicitly prevent these two commands of *turning off* the check.

In that case, you might use `M302 S65` or similar to drop the `MIN_TEMP`.

> **Comments:**
> **username_0**: Thx, i have added the flags too, still nothing. Any thoughts?  
> **username_2**: @username_0 that seems like your firmware bans those two because someone wanted to be smart in writing it. A lower min-Temp is the solution then.  
> **username_3**: If one's firmware has no override, an alternative solution without flashing might be wiring an additional resistor to fake the output of the thermistor and shift it up to a range the firmware allows printing at. Depending on if you're more comfortable with software or electronics this could be either easier or harder.  
> **username_2**: @username_3 that's.... tricky and might be dangerous in case you miscalculate: you practically loose temperature control if your resistor is off by half a percent!  

---

### Answer by username_0 on 2021-01-30. Score: 3

In Cura Machine Settings, add `M302 S70`.

Apparently, `M302 P1` and `M302 S0` do nothing, you need to define a non-zero minimum, and in my case, 70. Thanks to username_1 and username_2 for your help.


---

