This print-in-place concentric star is a great showcase of a well-tuned Ender 3 Neo. Knocking this out support-free means the overhangs in the STL were designed perfectly and your machine's cooling and retraction are really dialed in. Otherwise, those tight tolerances would have just fused solid. Running an 8-hour print with 30% infill was a smart move—it gives the fidget toy a nice, solid feel and makes the moving parts highly durable. Plus, using dual-color filament is an absolute game-changer for spiral geometries like this. As the layers shift and rotate, the orange and red transition beautifully, making the whole mechanism pop.