Sphere Test for stringing and sagging issues

Recently, I had issues printing spheres and threaded rods with my A1, so I designed this model to understand the cause. This is a hollow spherical shell printed in PLA, designed to test overhang performance, surface quality, and bed adhesion. The model has a circular top opening and a small flat base, making it a good benchmark for tuning print settings. Long story short: I ended up reducing the print speed and replacing the original nozzle, which had over 450 hours of use.🛠️ Comparison: Before vs AfterThese photos show the dramatic improvement achieved.🔴 Top View – Before:The print shows severe bridging issues and messy overhangs at the top opening. The inner walls are sagging, and stringing is visible.🟢 Top View – After:The same model results in a clean and well-defined top opening. The overhangs are handled properly, with no drooping or stringing.🔴 Bottom View – Before:The base of the print shows signs of poor bed adhesion — material has bunched up and partially detached from th