You scrap it because you got the measurements wrong. 
We never had any trouble on the punch press, which is by far, the fastest and easiest way.
Where problems showed up was forgetting, or reversing the "Bend Allowance", (Heard it called "R factor" in Ca. )
It's standard at half a material thickness per bend, but it's + in one direction and - in the other.
Also that standard assumes 90 degree bends.
It's actually easy enough, you just have to pay attention.
25 years ago, I’d agree that a punch press was faster than a laser system. Since then, laser tech has advanced by leaps and bounds. Tolerance was the same regardless and punching metal over 1/4” mild steel was tough on tooling. When I started in the shop back in 96, we had two turret punches and a small Amanda laser. Today, they have only the two lasers remaining and the shop output is 400-500% more productive.
My last gig, we had just a crusty old punch/laser system the company bought used off of EBay. I convinced the management to invest in a 4KW Co2 laser system. They did and the shop throughput went up exponentially and our sales doubled! If the dipshit GM and Plant manager had placed the machine in a better location and installed the factory lift system, with the proper placement of raw materials, who knows?
Buying the right equipment and using it poorly is stupid. Another issue we faced was ignorant engineers that expected more than the equipment was designed to produce and belittling a competent operator when it didn’t produce what it was not designed to produce.
Moral of this? Most engineers are ignorant assholes…..
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