Armed and Unhinged
I'm with ya, the little bit of $ you save will be eaten up by waste, wasted labor, labor when you finally get it right, and headaches.bending the odd bend with blankets and hotboxes is all I've ever done. I don't know why you would want to even try bending 90s. what a waste of time, and a recipe for failure. as usual, just my stupid opinion.
I have watch a guy spend at least an hour on one bend; running back and forth numerous times to get 1 offset right. And in the end it still wasn't great, 2 45's would of been better.
To get to the point where it will be majory profitable will require a large investment of waste, wasted labor, ect. And as wild said, just my stupid opinion.