Do you guys have any suggestions, or experience with jig styles that make precise and repeatable cuts for collector pipes? I have few ideas, but im not sure they are the best...

 

Post up the ideas and we'll tell you if their good or not. I really dont have a jig. I just have a piece of angle iron that i bolt down to my bandsaw at any random angle.

 

I do the same. I have my angle iron marked and my saw so everyone I make is the same depending on the size.

 

I have a piece of cut angle iron that I epoxyed a magnetic stip on the bottom.

It's all going to be the same. Just figure out the degree of the cut<s> you need, mark them & put up a piece of angle iron to act as a wall you can brace it against.