1 Topic by TheOldMan

  • TheOldMan
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Topic: E3d and PID tuning

Finally installed a v5 e3d hot end on my solidoodle 1. (Thanks hunter for the instructions).
I can heat to 300+, and have not noticed any problems yet (no led flicker, no slow bed temp, etc).
But when I run the hotend PID tuning (M303 S200 C5), I get the following error: "PID Autotune Failed:! Temperature to high"
During the tuning process, I see temp jumps up to ~14C.

Is this normal? Is there something else to change in the firmware to fix this?

I did a search, and found a few other PID settings to try. I will post back if any of them work....

2 Reply by elmoret

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Re: E3d and PID tuning

Solidoodle 1 (!)

You can either limit max heater PWM in firmware, or dial back the P and I values initially so the algorithm can find them correctly. Currently the controller is too aggressive, resulting in overshoot.

Filastruder - the robust, inexpensive filament extruder
E3Dv6 All Metal Hotend - the premier 3D printing hotend

3 Reply by TheOldMan

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Re: E3d and PID tuning

Yes, a 1 (#1310). With original fire-cement hot end. It's been fine until now, despite bouts of break it then fix it smile

I tried using P/I/D of 13.2, .71, 1.66 which I found in another post. Interestingly, it will hold 195 within 0.2 degrees with those values, but alas that is too cool for abs.
What I find odd is the huge temp leaps (~13 degrees) only occur during the initial heat-up phase.  After it passes the target and starts to cool, the jmps are much more modest (max of ~ 5 degrees).

I'll try dropping the max heater pwm (that the 255 value, right? I'll find it...) and report back later.

Thx elmoret.

4 Reply by elmoret

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Re: E3d and PID tuning

TheOldMan wrote:

What I find odd is the huge temp leaps (~13 degrees) only occur during the initial heat-up phase.  After it passes the target and starts to cool, the jmps are much more modest (max of ~ 5 degrees).

That's not odd, that's characteristic of an underdamped dynamic system. It means you could use a little less P or a little more D, assuming there's anti-windup in that firmware for the integrator term (there is in current versions of Marlin, not sure about back then)

TheOldMan wrote:

I'll try dropping the max heater pwm (that the 255 value, right? I'll find it...) and report back later.

That's the one!

Filastruder - the robust, inexpensive filament extruder
E3Dv6 All Metal Hotend - the premier 3D printing hotend