We are Norman Advanced Robotics, a group of mostly high school students and we are currently working on an underwater ROV for a professor at the local university (OU). The ROV is intended for surveying organisms on the lakebed of Lake Tanganyika at a maximum depth of ~60m. Our epoxy-coated PLA design worked for a little bit and then failed, with water entering the hollow part and pushing the epoxy out from the inside.
We plan on imitating this BlueRobotics part but the 2D drawings do not indicate the diameter of the part that the 238 O-ring touches.
If someone could give us proper dimensions and a correctly sized O-ring for a flange for a 4.5" ID tube, it would be greatly appreciated.
Norman Advanced Robotics (Andrew Zhang)