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I do like the test and thanks for sharing it. I have included pics of my print with original ventring.
My cooling fan stays at 100% for PLA.
A thought on the decreased quality from observing it in action is the stock one is sending a slight bit of air under the curves, great if
everything is optimized for just 1 directional cooling. Downside to stock is anything decent sized with infill inhibit's cooling to the freshest
edge on the back half of a print. One of the reasons I designed this from ground up vs the modified CR-10 cooling rings i tried.
How does your Bridging print?
Trying to print a thin strip at 50 degrees or steeper without support is a fun test but no model should be designed to rely on it.
I have tried to adjust airflow to maximum benefit for all micro-swiss Hot-ends as some fans are not as potent just between My Ender-3 and the ones my friends / co-workers received. I will upload a Short-V2 variant with wider vents for everyone to test. Adjusting back-pressure
to keep airflow equal.