重新按图纸画了一套，4个角的孔位改成直径4.8，以免打印误差螺丝后塞不进去。导出了5/10/15mm三个版本

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I redrawn a set according to the blueprint, and the holes of the 4 horns are changed to 4.8 diameter to avoid the printing error screws cannot be plugged in.Export three versions of 5/10/15mm