<p>lI have an older spool of PLA filament which has absorbed some moisture and doesn't print well at normal PLA temperatures, but does at higher temps like 220+ °C. Attempting to print at this temperature range has led me into a number of issues:</p>
<ol>
<li><p><code>M112</code> shutdown thermal runaway. The print appeared to be going perfectly fine until the firmware shut down with <code>M112</code> Thermal Runaway about 15-20 minutes into the print</p>
</li>
<li><p>Attempting PID tune with <code>M303 E0 S240 C20</code> failed with <code>PID Autotune failed! Temperature too high</code></p>
</li>
<li><p>Re-attempting PID tune with <code>M303 E0 S235 C20</code> resulted in OctoPrint losing the serial connection: <code>State: Offline after error Too many consecutive timeouts, printer still connected and alive?</code>. Autotune appears to have succeeded on the firmware,</p>
</li>
</ol>
<p>To mitigate issues with the serial connection, I've switched to a 3 ft long micro-USB cable with ferrite core and gold-plated connectors. I''ve also taped the 5 V pin. The voltage at the outlet connected to the printer is around 121 V.</p>
<p><a href="https://i.sstatic.net/iXkaUUj8.png" rel="nofollow noreferrer" title="Temp graph"><img src="https://i.sstatic.net/iXkaUUj8.png" alt="Temp graph" title="Temp graph" /></a></p>
<p><a href="https://i.sstatic.net/cWbN2b3g.png" rel="nofollow noreferrer" title="Temp graph"><img src="https://i.sstatic.net/cWbN2b3g.png" alt="Temp graph 2" title="Temp graph" /></a></p>
<p><a href="https://i.sstatic.net/bShm7BUr.jpg" rel="nofollow noreferrer" title="LCD"><img src="https://i.sstatic.net/bShm7BUr.jpg" alt="LCD" title="LCD" /></a></p>
<p><a href="https://pastebin.com/hkNVt3a0" rel="nofollow noreferrer">serial.log</a></p>
<p>Is there a way to ask the firmware to provide more details before crashing with an <code>M112</code> thermal runaway error?</p>
<p>What could be causing the failure to PID autotune and frequent serial disconnects at higher temperatures?</p>
<p>This is an Ender 3 Pro with Marlin based on the <code>bugfix-2.1.x</code> branch.</p>

CC BY-SA 4.0
2024-07-26T12:33:37.733Z
Does the same problem occur when printing a higher temperature filament? E.g. PETG at 240 °C.
0scar
CC BY-SA 4.0
2024-07-26T21:45:25.450Z
I haven't tried printing PETG lately, I will try. My last PLA 16h print actually succeeded at around 205C after I manually saved the PID tuning values into EEPROM via the LCD. I will try printing PETG at 240C and report back but for now I cannot reproduce the problems I descrcibed.
user84207
CC BY-SA 4.0
2024-07-27T13:19:38.767Z
Long shot, but is the hot end fan running when you are calibrating for new hot end PID values.
st2000
<thermal-runaway><serial-connection><pid>
Lots of issues while trying to achieve higher temperatures
user84207
# Lots of issues while trying to achieve higher temperatures

(Asked by: username_0 on 2024-07-25)

lI have an older spool of PLA filament which has absorbed some moisture and doesn't print well at normal PLA temperatures, but does at higher temps like 220+ °C. Attempting to print at this temperature range has led me into a number of issues:

1. `M112` shutdown thermal runaway. The print appeared to be going perfectly fine until the firmware shut down with `M112` Thermal Runaway about 15-20 minutes into the print
2. Attempting PID tune with `M303 E0 S240 C20` failed with `PID Autotune failed! Temperature too high`
3. Re-attempting PID tune with `M303 E0 S235 C20` resulted in OctoPrint losing the serial connection: `State: Offline after error Too many consecutive timeouts, printer still connected and alive?`. Autotune appears to have succeeded on the firmware,

To mitigate issues with the serial connection, I've switched to a 3 ft long micro-USB cable with ferrite core and gold-plated connectors. I''ve also taped the 5 V pin. The voltage at the outlet connected to the printer is around 121 V.

[![Temp graph](https://i.sstatic.net/iXkaUUj8.png "Temp graph")](https://i.sstatic.net/iXkaUUj8.png "Temp graph")

[![Temp graph 2](https://i.sstatic.net/cWbN2b3g.png "Temp graph")](https://i.sstatic.net/cWbN2b3g.png "Temp graph")

[![LCD](https://i.sstatic.net/bShm7BUr.jpg "LCD")](https://i.sstatic.net/bShm7BUr.jpg "LCD")

[serial.log](https://pastebin.com/hkNVt3a0)

Is there a way to ask the firmware to provide more details before crashing with an `M112` thermal runaway error?

What could be causing the failure to PID autotune and frequent serial disconnects at higher temperatures?

This is an Ender 3 Pro with Marlin based on the `bugfix-2.1.x` branch.

**Tags:** thermal-runaway, serial-connection, pid
> **Comments:**
> **username_1**: Does the same problem occur when printing a higher temperature filament? E.g. PETG at 240 °C.  
> **username_0**: I haven't tried printing PETG lately, I will try. My last PLA 16h print actually succeeded at around 205C after I manually saved the PID tuning values into EEPROM via the LCD. I will try printing PETG at 240C and report back but for now I cannot reproduce the problems I descrcibed.  
> **username_2**: Long shot, but is the hot end fan running when you are calibrating for new hot end PID values.  

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## 0 answers

