MY mother used to despair at my mucking about with animals.

我妈妈以前也常嫌弃我爱和动物混在一起。

After the year 2000, 3D printers suddenly got much cheaper and tech companies started mucking about with them – spending time playing with them in a fun way.

2000年之后，3D打印机突然便宜了很多，科技公司开始鼓捣它们——以一种有趣的方式花时间摆弄它们。