Mismanufacture

This is not to indicate that feeds are not mismanufactured and can and do create problems, which should and in most cases are handled by the company and insurance procedures.

Source: wiktionary

We believe that Carlos Torres was probably the guy who mismanufactured the firing train which led to that bomb going off in Willie's hands.

Source: wiktionary

Thus, "federal law provides no defense to the military contractor that mismanufactures military equipment or that is itself ultimately responsible for the design defect.

Source: wiktionary

Negligent manufacture or mismanufacture most frequently involves an aberrance in the manufacture, inspection, or testing of a product that creates individual or multiple product mishaps.

Source: wiktionary