As to the warranty for the shoe cover machine,normally it is one year since we deliver out the goods.
If you meet problem with the machine, you can send us video or picture to explain the problem, we will teach you how to solve it. If it need to replace spare part, we will provide spare part for free if within warranty, regarding the delivery of the spare parts ,we can negotiate.
As to the formal order. such as 20pcs, we will provide some free spare parts in advance, when meet problem ,technical people can replace spare parts by themselves.