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Cura 3.4.1 Cooling fan stops/starts intermittently

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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?

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7 hours ago, red_star_rc said:

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


It's not enabled by default:


                    "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.

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