A lot of what you're looking at is available in better forms for decent cost, as Doug says. The big parts that give the trouble are the body of the tank itself, which really needs to be printed in sections(if in sections at all) much larger than the 8 inches most FDM printers provide. Larger printers are available, but by the time one buys one, gets it going well, and prints out a tank, you are one or two premade tanks' worth of money in the hole. Might as well just buy an FOA or other tank as a kit or ready to go, especially since very few people will be building the numbers to really justify such.
I've waffled a few times between printing tanks, and using vacuum/pressure forming as is the current plan if I ever get to setting up production. It means less tooling, but big prints like that are tricky.
On Monday, March 23, 2020 at 12:54:27 PM UTC-4, ~D wrote: