Anycubic 4Max 85mm Circular Fan Duct

thingiverse

Uploaded two additional designs previously, utilizing the fang type fan duct, which performed well initially. However, I encountered issues due to the fangs, making it impossible to employ a belt tensioner for the X carriage belt. Additionally, I acquired a silicon nozzle sock, causing the fan duct to excessively cool the nozzle. Despite running several PID tuning tests, the problem persisted, and my X belt began to wear out, necessitating a tensioner. Consequently, I designed a large circular fan duct. After conducting four prototypes and extensive testing, I arrived at this design. It features a support that enables it to "hang" on the outer side of the X carriage, which was previously a challenge due to its tendency to hang after a few hours of printing. Although installing the fan duct is somewhat difficult, it remains feasible. Significant measuring was required to ensure proper alignment between the nozzle and the fan duct. During testing, the duct crashed into the X stepper motor bracket, prompting me to lower it so that it just passes underneath the bracket at an X reach of 212mm. To optimize airflow, I drilled three holes after the final test, as the previous configuration was blowing too much air directly below the fan. The bridging test videos are available for viewing, showcasing its performance, including a 150mm test that exhibits some hanging lines. However, I'm uncertain if anyone requires a 150mm bridging capability, and it still functions adequately with these limitations. The bridging test used in this design can be found here: https://www.thingiverse.com/thing:2565433 To print the fan duct, stand it upright, utilize custom supports, and remove any supports present within the channels. The printer should be able to bridge 15mm without issue; most printers will have no difficulty with this task. Print using PETG or ABS to avoid issues with the fan duct hanging on one side after a period of use.