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i have had to print the 4010_pipes 5 times now, (and switch to 0.1mm layer height instead of 0.3) because the connectors that hold the top piece and the fan duct together are flimsy, bound to break and, once broken, make it so you have to print the entire thing again. i know that a lot of engineering went into designing the airflow for this thing, but i would have appreciated it if some more time was put in this part of the design.