Misfabricate

But "the rub" comes when unscrupulous fabricators or finishers skimp, misfabricate, or poorly process these yarns and cloths.

Source: wiktionary

Members which have been misfabricated may be subsequently refabricated if they are determined to be structurally adequate.

Source: wiktionary

Shortly thereafter, Carter misfabricated 400 sink brackets. During his testimony, he claimed the brackets were misfabricated because, inter alia, he had used a faulty diagram prepared by an employee who had fabricated such brackets on a prior occasion.

Source: wiktionary