The weather was slightly stupid hot over the weekend so I started making a header mock-up kit, only cause I seen Dave's Garage do it and thought I might need those one day for my cars.
They are 1.5in dia for now but will make larger ones later on.

Parts have raised size indicator and lines so you can match up what angle you need to transfer to the real stainless pipe, there's 16x pieces in this donut !

Making the straight parts I started with a 1in and and doubled it till I got to 4in, and then remove the top one for the 3in tubes , different colors for different heights
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Action shot of more curves being printed, this bunch was a throw away as the feed didn't like doing silly dots so I turned the tubes facing side on and came up spot on, still learning this stuff!