Using our powerful Radial Material cooler may cause the Heatblock to over-cool and you will get a Thermal Runanway Error message when printing. This is because of incorrect PID tuning.

We recommend you to let the material cooler run at 70-85% instead of 100%, otherwise it may cool too much and the adhesion between the layers will decrease. You can then increase performance to 100% when printing overhangs or when printing small parts at high speeds.


To adjust the extruder values, use Pronterface to enter the following commands:

M106 S204 (set cooler too 80%)
M303 E-0 S220 C8 (Start PID Tuning, chose Extruder 0, target temperatur 220 degree at 8 measuring cycles)

 

Now you wait until your console displays a message with the determined values ​​like this:

bias: 91 d: 91 min: 206.48 max: 213.59
Ku: 32.59 Tu: 26.48
Classic PID
Kp: 19.56
Ki: 1.48
Kd: 64.72

Now you store the determined values ​​(Kp, Ki, Kd) in the EPROM with the following commands:

M301; P19.56 I1.48 D64.72
M500 (save)

 

Now the temperatures should remain constant during the print. If you print with a material at very different temperatures and fan speeds,  it may be necessary to adjust the PID tuning to these values.


Of course you can also change these values ​​in your firmware (Configuration.h):

#define DEFAULT_Kp 19.56
#define DEFAULT_Ki 1.48
#define DEFAULT_Kd 64.72