# Start Gcode for multiple print cooling fans **URL:** \ **Category:** General Discussion\ **Created:** [December 15, 2024, 5:53pm UTC](https://klipper.discourse.group/t/start-gcode-for-multiple-print-cooling-fans/20701 "2024-12-15T17:53:19Z")\ **Posts on this page:** 1\ **Showing post:** 5
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [December 16, 2024, 4:00pm UTC](https://klipper.discourse.group/t/start-gcode-for-multiple-print-cooling-fans/20701/5 "2024-12-16T16:00:02Z")
You may try the solution on this thread: > [@IDEX Parts cooling fan turned off](https://klipper.discourse.group/t/idex-parts-cooling-fan-turned-off/2160): > > I have an IDEX printer, and I want to activate the fan of the second extruder when the tool is activated, I saw a Macro here, so I just copied, but still not working. So, basically something is sending the SET\_FAN\_SPEED FAN=extruder1\_partfan SPEED=0 when the tool changes. [klippy.log](https://klipper.discourse.group/uploads/short-url/jo0weErOlpf1T6bN7X9jEv0yo1F.log) (931.1 KB) Should I write something on the GCode of the Tool Change? I tried but did’t worked. Appreciated [fan\_generic extruder0\_partfan] pin: PB0 [fan\_generic extruder1\_partfan] pin: PB1 [gcode\_macro M106] … --- _[View the full topic](https://klipper.discourse.group/t/start-gcode-for-multiple-print-cooling-fans/20701)._