Cooling M303 warning at higher temperatures.

[daveh]

When I run M303 T0 S215 tuning completes without warning.

When I run at 250, I get the following message:

Warning: Turning on the print cooling fan did not increase hot end cooling. Check that the correct fan has been configured.

I'd agree with the statement when the cooling fan is on, it doesn't increase cooling which is already quite rapid. However, it does significantly slow heating - it probably takes twice as long to reach the temperature for each cycle.

Is the warning a problem? Should I discard the results and stick with the tune from the lower temp?

[Phaedrux]

Can you try tuning at a lower temp? Like 240? At what temp does the warning start to display?

[daveh]

@phaedrux Success at 230, 235, Warns at 237.5, 240

[Phaedrux]

What firmware version are you using?

[daveh]

@phaedrux RepRapFirmware for Duet 3 Mini 5+ version 3.3 (2021-06-15 21:46:11) running on Duet 3 Mini5plus WiFi (standalone mode)

[Phaedrux]

When tuned at 235 are your temps stable?

[daveh]

@phaedrux just tested, it seems so. I turned it to 250c overshot by 2c, waited a minute turned the fan on dropped a couple and it looks pretty stable now: