Extruder gradually loses heat on the same layer and position

General Discussion
1

Basic Information:

Printer Model: Voron Trident 300mm
MCU / Printerboard: Fysetc Spider v2.3 + BTT EBB SB2209 (RP 2040)
Host / SBC: BTT CB2
klippy.log

klippy.log (4.3 MB)

Describe your issue:

IMG_20250824_111328_015
IMG_20250824_111328_0151920×960 251 KB

Hello. I’ve been struggling with this issue for a long time and haven’t been able to resolve it despite trying everything. The extruder gradually cools down after a certain point, and when I try reprinting the same model, it stops at the same layer and almost the exact same position (as shown in the image), even after moving the model to a different spot on the bed.

Sometimes this error appears a few minutes after starting the print, and other times it shows up after several hours (usually, the larger the model, the longer it takes for the error to occur).

I primarily print small items with ABS (which were the error mostly appears), but I recall printing larger models with PETG a few months ago without encountering this issue.

Error message:
Heater extruder not heating at expected rate.

This error occurred today, August 24, 2025.

2

Hello @jessi3dp !

grafik
grafik498×261 3.28 KB

You limited the power of the extruder to 70% in line 14.

[extruder]
step_pin = EBBCan:gpio18
dir_pin = EBBCan:gpio19
enable_pin = !EBBCan:gpio17
microsteps = 32
rotation_distance = 13.24523704
gear_ratio = 50:17
full_steps_per_rotation = 200
nozzle_diameter = 0.400
filament_diameter = 1.750
pressure_advance = 0.025
min_temp = -50
max_temp = 290
max_power = 0.70
min_extrude_temp = 0
max_extrude_only_distance = 105
max_extrude_cross_section = 5
heater_pin = EBBCan:gpio7
sensor_type = Generic 3950
sensor_pin = EBBCan:gpio27
control = pid
pid_kp = 12.032
pid_ki = 0.418
pid_kd = 86.630

Either you delete that line or set the value higher.

BTW: You limited the power of the bed too.

4

For extruder, that was intentional. It is a 80w cartridge heater and it smells like burn if it was 100% power. But I’ll try increasing the max power.

For the bed, I just followed the recommended power based on Voron manual.

5

When it smells, it has to do with temperature, not with power.

7

Hello @JohnSmith

This would lead to an immediate error and shutdown of the printer.

In this case the issue is the limitation of the heater power to 70%

1 Like
8

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