Cura 3.4.1 Cooling fan stops/starts intermittently

[red_star_rc 0]

Anet A8, Octoprint. During print cooling fan stops for a second then starts again intermittently. Fan LED on the board turns OFF in that moment and than turns ON again. Analyzed g-code Cura generated and found multiple blocks with M107 - M106 commands. So Cura does turn fan off/on during print. Is that normal?  How to disable it?

[burtoogle 513]

The bridging code can alter the fan speed and so if you don't want it to do that you will need to fiddle with the bridging settings.

 

A new feature (not yet available) can alter the fan speed when printing skins over support.

[red_star_rc 0]

Bingo! Apparently hidden experimental option "Enable Bridge Settings" enabled by default. When I revealed and unchecked it I didn't find any M107 codes. Fan stays ON all the time during print now. Thank you so much!

[burtoogle 513]

7 hours ago, red_star_rc said:

Apparently hidden experimental option "Enable Bridge Settings" enabled by default.

 

It's not enabled by default:

 

                "bridge_settings_enabled":
                {
                    "label": "Enable Bridge Settings",
                    "description": "Detect bridges and modify print speed, flow and fan settings while bridges are printed.",
                    "type": "bool",
                    "default_value": false,
                    "settable_per_mesh": true,
                    "settable_per_extruder": false,
                    "settable_per_meshgroup": false
                },

The default value is false so you must have enabled it yourself.

[red_star_rc 0]

Don't remember. Anyway problem solved.