I have already started printing and sourcing parts for this project. I'm truly excited to get started on it. I have been using your hexagon cooling shroud and z-probe servo mount and am very impressed with the solid design. My question is have you had any issues with the 3cfm fan cooling both hotends on extended prints? It has been doing a good job on my single hexagon hot end, but I would be doubling the heat in that area.
Also how critical is the spring tension used on this build? I have a hardware store across the street with a good selection and I'm hoping I could bring my completed extruder over there and find something that would work.