FlashForge Creator Pro left single extruder fan duct

thingiverse

The text describes the challenges and solutions for achieving optimal cooling with a 3D printing duct, particularly when using filaments like PETG or ABS. It highlights the importance of variable speed control for fan operation and explains why software-based solutions are not feasible for printers using the MightyBoard design. To obtain variable fan speed, the article suggests installing a hardware PWM (Pulse Width Modulation) controller between the printer motherboard and the cooling fan. This can be done with an analog controller or a microcontroller like an Arduino. Alternatively, it proposes using a Raspberry Pi to send fan speed commands and do PWM through a MOSFET connected to one of its GPIO pins. The article also discusses possible workarounds that don't require a PWM controller, such as sticking with the dual duct design, printing hotter and slower, or boosting extruder temperature before the fan engages. However, these solutions are considered inferior compared to PWM-based solutions. Finally, the text invites readers to watch the design for updates and offers a "tip designer" button as a way to show appreciation for the work that went into designing the duct.