乒乓球scratch
scratch物件旋轉
乒乓球scratch背景替換
乒乓球機scratch物件位置
3d列印適用乒乓球檔案
https://www.tinkercad.com/things/4eqLlIhLNHU
3d列印適用60mm球檔案
https://www.tinkercad.com/things/jKNVYcCbiKI
