Repeated Hotend Thermal Runaway issue during thermal calibration
For context: I decided to replace the fans of my Prusa because they were going bad. The new installation went mostly fine but after a few prints I was getting a THERMAL ANOMOLY issue. I decided to run a thermal calibration test see if that would fix the issue.
The problem: During thermal calibration the printer raises the temp to 230C then cools to <50C. The first time this happens there is no problem. The printer will attempt to redo this process. The printer reaches about 221C and then the side fan kicks on to what seems to be full speed. This causes the temperature to drop to about 208C where it sits. My assumption is the printer is competing with the fan to reach 230C and after the 45 seconds of no temperature movement it throws the THEMAL RUNAWAY error code. This exact behavior is repeatable every time I do a thermal calibration.
Things I Tried: I tried a fresh calibration using the Wizard and made it to the thermal calibration step before failing. I also ran the PID calibration without any issues but I had a target of 210C instead of 230C.
OctoPrint Log: I connected octoprint to my printer and was able to capture the GCode before the crash and got the following log:
Recv: echo: M310 I0 R16.95
Recv: echo: M310 I1 R18.94
Recv: echo: M310 I2 R17.47
Recv: echo: M310 I3 R14.53
Recv: echo: M310 I4 R12.82
Recv: echo: M310 I5 R11.11
Recv: echo: M310 I6 R9.41
Recv: echo: M310 I7 R7.70
Recv: echo: M310 I8 R7.48
Recv: echo: M310 I9 R7.25
Recv: echo: M310 I10 R7.02
Recv: echo: M310 I11 R6.80
Recv: echo: M310 I12 R6.64
Recv: echo: M310 I13 R6.49
Recv: echo: M310 I14 R6.34
Recv: echo: M310 I15 Rnan
Recv: echo: M310 P38.00 U0.0000 V1.00 C12.92 D0.0650 L2160 S1 B0 E1.74 W1.20 T-7.00
Recv: LCD status changed
Recv: Error: HOTEND THERMAL RUNAWAY
Changing monitoring state from "Operational" to "Error"
OctoPrint Temperature Graph: To help visualize the temperatures I was talking about earlier.
Additional Info:
I am using these fans FYSETC 3D Printer Part 4010 5015 Fan DC 5V
Does anyone know what the issue could be? I don't have a silicon sock to try but I am hesitant seeing that the official page says they have not seen it provide much help with thermal related errors.
Best Answer by Kinglurtz:
I solved it by swapping out the fan with the official one sold on Prusa's website. My best guess is the fan from amazon was to powerful.
RE: Repeated Hotend Thermal Runaway issue during thermal calibration
I solved it by swapping out the fan with the official one sold on Prusa's website. My best guess is the fan from amazon was to powerful.