> When cutting parts, the cost isn't in cutting the parts. The cost is setting up the machine to cut the parts. The cutting cost is trivial. When you're buildi

> When cutting parts, the cost isn't in cutting the parts. The cost is setting up the machine to cut the parts. The cutting cost is trivial. When you're building a one-off, you aren't setting up a machine to cut the parts. You're just cutting the parts more or less by hand. It'd be too expensive to set up the machine, and calibrate, and run all of the prototypes to make sure it works, if all you need is a couple of pieces out of it.