A "manufacturing flaw" refers to a mistake or problem that occurs during the production of a product. It means that there is something wrong with the way the item was made, which may affect its quality or functionality. Full definition
I was also informed that there are two manufacturing flaws in the bloody thing that could take up to a week to repair. (housegoeshome.com)
The purposeful manufacturing flaws demonstrated in this work range from two - dimensional features to three - dimensional shapes that can be hidden inside the part. (sciencedaily.com)
If a new car is a lemon, i.e. has some sort of manufacturing flaw, neither the buyer or the seller are aware of the flaw and the manufacturer usually covers the repairs if the flaw is discovered within the warranty period. (studiotendra.com)