Ender type Ring cooler-inator
thingiverse
A quick test for a stock fan compatible cooler designed specifically for Ender 3 printers. It fits perfectly within the 3D model. The Petfang Bullseye is an awesome design, but it has one major flaw aside from internal air resistance caused by multiple sharp turns: airflow is directed towards the back, leaving that area poorly cooled. So far, this setup prints well, and I used ring breakaway custom supports because you can't have supports inside the ring structure; however, the fan hole requires additional support. This project is still in progress, but I ran out of filament.
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