Our engineer at work has stuff made here. Shapeways: Industrial 3D Printing Service She makes up the file and they print the parts. They can do the whole thing, but no doubt will cost more. Her stuff is on there as 'Days Mill Designs'
Do they have them with multiple print heads? Would think a few overlapping to build a long grill could work.
They do. But they are HUGE commercial units. And not cheap. Honestly, by the time you add up the raw costs of materials, you’re gonna be at or more than the cost of the factory reproduction grilles already being offered.