heater fan slow down when start printing

thor3k

Hi guys, a little introduction: this is Marco from Italy, I started making some modification on my Anycubic predator, placing first a Duet 3 board... some issue solved but, i've some headhake with one thing:

When i turn on the printer the hotend fan is off, (I setup it to work in thermostatic mode at 50°C); when the hotend reach and pass that temperature, the fan start at 100%.... (good); issues come when I start printing (I use simplify 3D) because the fan slow down and I can't understand why. this (with wavy bed mesh) is making me Crazy.

Somebody can help me understand?

thank you all guys!

Marco

PS: this is my config File
config.g

Phaedrux

M106 P1 C"Ventola_Dis" S1 H2:1 T50

Try changing the H2:1 to just H1

If that doesn't work please post a sliced gcode file so we can see if S3D is changing anything.

thor3k

Hi Phaedrux, thank you for fast answer.

I've tried, unfortunately nothing change.

attached the last gcode i've made... I search for the M106, what i've not understood is how the board discriminate which fan start when it wrote M106 S255 when start the layer 2 on the example attached..

to complete the information (probably it helps understand where I get wrong):

(Ventola_Est = cooling for parts; Ventola_Dis= hotend dissipator cooling fan)

Phaedrux

I see the problem now

M563 P0 S"Estrusore1" D0 H1 F0:1:2 ; define tool 0

That should be just F0 and not F0:1:2

The slicer doesn't know which fan it is controlling. It's the Duet that attaches a fan to a tool, and for you that should be Fan0 only.

thor3k

Hi again Phaedrux, that's it! thank you!

I put too much trust in my reprap firmware wizard

Thank you very much... now step by step I try solve other things on my config!

Phaedrux

Are you saying that the config tool gave you that tool command with all 3 fans even though the screen shot only shows fan0 selected? Or was it edited afterwards?

thor3k

I just understood what i've done, I opened the editor by the button on System folder:

i was thinking it was the actual configuration, but it's the first Json config i've made, probably the mistake come from there...

sorry if i gave you some wrong info