I’m trying to 3D print Wetlink Penetrators using the 3D models available on the website for an ROV I’m working on. The inside of the model isn’t complete, so I have to work on those; has anyone done this before? Additionally, seal sizing for the outside diameter isn’t available, so how thick are the seals? What should I keep in mind moving forward? Thanks in advance.
Hi @mayadreymann -
I can appreciate trying to save money, but WetLink Penetrators are quite affordable! Especially given that you can create a seal to 1000m (!) with a properly sized and assembled unit…
Unfortunately I don’t think printing the seals is going to work, even if you used a flexible material like TPU filament. The information isn’t included in the model because it’s a proprietary aspect - while much is open source, some things aren’t, as it would be tough to make money that way! A ton of work went into finding the right material, and the right geometry, to create this reliable solution. We’re talking hundreds of cable whips tested!
I am not printing the seals, as I recognize that is largely impractical. I will instead be purchasing the Blue Robotics O-rings and seals while printing the penetrator itself. I will be SLA printing using the Formlabs Black Resin. If you still don’t think my plan is viable, do you know any cheaper alternatives? Though the Wetlink Penetrators are quite affordable, we are already in a tight spot regarding cost, and are looking to save wherever we are able. Thank you for your response!
Hi @mayadreymann -
Understood. That certainly has a better chance of success, however I would not expect that approach to work at depths of more than a few meters, or if any sharp impact loads / tugs occurred on the cables using the penetrators. Simply tightening the plug into the seal will likely cause a failure, as significant compression force on the bolt from the threads is developed as the seal is compressed.
Generally, optimizing for cost of one of the lowest cost components, that has the greatest potential cost impact if it fails (leaking and damaging internal electronics) just doesn’t make sense to me!
I would recommend sorting the bill of materials by cost, and seeing where you can save on the costly side of things… Often electrical components are possible to find alternatives too! Also checkout the Abyss for discounted components…
Word of advice: Leaking penetrators are a nightmare to deal with. You will waste money and so much time trying to figure out why your enclosures won’t hold a vacuum.
And think about the consequences of a penetrator failing during a dive. How much could that cost your project?