Extruder flow - strange increase

General Discussion
1

Basic Information:

Printer Model: Ratrig v300
MCU / Printerboard: BTT Octo 1.1
Host / SBC RPi 4
klippy.log

printer config 2025-04-22 Updated Kick start.cfg (20.9 KB)

klippy (10).log (6.5 MB)

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Describe your issue:

After a couple years good service, I had to a replace the MCU and extruder motor. On testing, the flow rate is unusually high. I’ve had to set it to 65% to get reasonable prints. I can’t think why this is, unless the e-motor is a somehow ‘faster’ than the original, but it’s from the extruder manufacturer, so I find that unlikely. The replacement MCU is same as before (BTT Octopus 1.1). My config file is unchanged. Any ideas? Is there a way to adjust the flow rate universally in printer.cfg?

2

After replacing the extruder, did you do an extruder calibration:

I know you’re saying that the extruder is from the “manufacturer” but it sounds like the actual parts may be different.

1 Like
3

Your printer.cfg is for a 400 count motor

[extruder]
step_pin = e_step_pin
dir_pin = !e_dir_pin
enable_pin = !e_enable_pin
microsteps = 64
rotation_distance = 7.68
full_steps_per_rotation = 400
filament_diameter = 1.750
max_extrude_only_velocity = 60
max_extrude_only_distance = 200
nozzle_diameter = 0.8
heater_pin = e_heater_pin
sensor_type = ATC Semitec 104GT-2
sensor_pin = e_sensor_pin
min_extrude_temp = 170
min_temp = 0
max_temp = 285
pressure_advance = 0.03
control = pid
pid_kp = 24.239
pid_ki = 1.293
pid_kd = 113.621

I bet the replacement is a standard 200.

4

Yes. It appears this is a 1.8 deg motor. Previously a 0.9 deg. Many thanks!:grinning_face:

5

Yes, that’s exactly the problem. Took a while to track down the code for steps/rev but seems to be working. Thanks for the help!:grinning_face:

6

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