I used to be involved in oceanographic research early in my career. I was a tech back then so my job was ensuring hydrophone arrays and equipment was sealed for the depths. One thing we did was fill array tubes with mineral oil. It’s nonconductive and doesn’t shrink under pressure. It was really good, just seal the ends and it kept water intrusion to nil. Also when we had anything that had a motor it prevented it from shorting out as well.
Great series, loved watching this, but I have a question: after he makes sure it's water tight, he makes a hole for the bearing/motor shaft and two other holes. How do these openings not allow water to leak in?
@@anthonyortiz7924 It was filled using a syringe, and if the grease is replenished frequently, the leak can be prevented. (Actually, I use Vaseline by melting it with a hot gun.)
@@tiver21 ahhh I see, I figured it must be a temporary solution and require replenishment. Thanks for replying, this series was so interesting to watch as someone who is just starting to look into RC.
Crazy amounts of underextrusion in the overall surface finish of that part at 4:15. Even if it passes the initial short term water leak test, long term you're going to get water gradually wicking its way through the plastic over time. If you want to persist with 3d printing parts for projects like this, the printer will serve you better by printing a negative mold that you can pour resin into or another similar material that won't absorb liquids as much.