Optimize the structure to be more suitable for TPU printing, making it less prone to side overflow

So far, only PLA printing has been tested and works fine. I haven’t had time to test TPU printing yet. If anyone is currently printing with TPU, feel free to try swapping the filament and see if it can speed up TPU printing.

TPU-gai20260418.stl (1.4 MB)

U1 TPU 防侧溢特殊优化零件 - 免费 3D 打印模型 - MakerWorld