Fan Duct Longer LK4 & LK4 Pro

thingiverse

This is a fan duct for Longer LK4 and LK4 Pro printers to substitute the original one. It features improved airflow direction, reducing unnecessary chilling of the block. Due to the poor tolerances of the ventilator support bend, it's essential to determine which spacer will work best for you. The included spacers are 2mm, 3mm, and 4mm thick. To find the optimal setting, simply attach the duct without the top spacer and adjust the screws until you achieve the desired height. Then, use a caliper or ruler to measure and print the corresponding spacer. I've added photos of other fan ducts I printed along with test results. I used the same G-code but changed filament due to the orange one running out; however, this doesn't significantly impact the outcome.