PID for hotend

Controllers Smoothie
1

Hello,
I’m using an E3D v6 hotend. I followed the procedure for calibrating the PID from the wiki (several times). The temperature I’m aiming for is 240C (I’m printing ABS). My current values, as given by the last PID autocalibration procedure are:

temperature_control.hotend.p_factor 43.3
temperature_control.hotend.i_factor 3.429
temperature_control.hotend.d_factor 137

The problem is I’m getting these large swings in temperature, no matter how many times I tried to auto-calibrate the PID.
- Can’t post links-

Any idea what might be the cause/how can I fix this?

Imported from wikidot

2

try reducing the max_pwm especially if it is a 24v cartridge heater

3

Hello,

have you determined the best setting for your PID and PWM?

I am having the same issue with E3D V6 24V, and temperature fluctuates alot and more than 8 degrees.

tried to lower the PWM and made it 60, then 56, and went down to 50, but still the results are the same

first test : PWM 60
temperature_control.hotend.p_factor 52.9
temperature_control.hotend.i_factor 3.646
temperature_control.hotend.d_factor 192

second test: PWM 56
temperature_control.hotend.p_factor 52.8
temperature_control.hotend.i_factor 3.529
temperature_control.hotend.d_factor 194

third test: PWM 50
temperature_control.hotend.p_factor 52
temperature_control.hotend.i_factor 3.483
temperature_control.hotend.d_factor 194

I moved on and tried to test print, and the fluctuation of temperature was vesible on the printing result, thick on print sides every 4 or 5 layers.

is it best to divide the max_pwm by 2? I mean make it 32 or ( 1/8th of the full on)

“I am a beginner in electronics”