Aggressive Front Fan Cooling Cycles are leading to "THERMAL RUNAWAY" error when printing first layers
I have a Prusa Mk2.5s running 3.14.0 firmware.
I have been having this issue for the past 3 years now where I would get a "THERMAL RUNAWAY" error after 1-3 layers being printed.
After watching a test print, the following happens:
- Print starts, the (Front) Fan Speed is at 28
- At Layer 1, the (Front) Fan Speed is at 84. This often leads to the "THERMAL RUNAWAY" error.
- At Layer 2, the (Front) Fan Speed is at 170. This will lead to the "THERMAL RUNAWAY" error.
- At Layer 3, the (Front) Fan Speed is at 255. This will lead to the "THERMAL RUNAWAY" error.
I am able to resolve each of these issues by manually tuning the fan speed back to 28.
I have tried different firmware versions, yet the issue persisted. I have tried replacing the front cooling with no changes. I also checked the voltage of the front cooling fan, which is 12v (both the original and replacement).
I would like to find a solution where I don't have to watch over my printer for the first 3 layers due to this issue. Any advice would be appreciated.
Cheers!
- E