3D printing has made this build by far easier. I have now created the thruster pieces from the Ole herman Godø thruster plans and am ordering motors for them soon. For very deep dives, the hollow nature of 3D prints may cause a crush hazard. As I have no money to send one of these to somewhere like WHOI for high pressure testing, the crush depth is, and may always be unknown.

Shown here is the 2 blade design which will soon be updated to 3 blades for ease of printing. I am also designing a plate which will keep the bottom pieces aligned on the robot. I plan to test the thrust output in fresh water soon. It is expected to be about 12.5N of thrust at the top end. But tighter control of thrust in the lower end. These will be used when maneuverability outweighs the need for speed.

Happy Hacking!