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3D Printed USV hull files available on Hackaday


(Kevin) #1

I found this USV project on Hackaday the other day and the project leader was kind enough to make the 3D files available for download. https://hackaday.io/project/25508-n3m0-the-autonomous-boat

I’m in the process of printing up my own hull and fitting it out with a Pixhawk 2.1 and 2x BlueRobotics thrusters. I think it will come out to be around 1m in length when complete, which is a much more mangeable size than my larger red USV. What I like this the top hatch to seal in all the electronics and I won’t have to use Pelican cases.

I’m thinking about making up two hulls so I can start playing with multi-vehicle options and maybe get some swarming actions going. It makes for a good size for the temperature sensor, a camera, and maybe a small single beam sonar.

It prints ok so far. I’ve had some delamination of the layers, probably due to the cooler room temperature and me not having an enclosure for the printer. Some filling and sanding of the gaps will be needed once everything is glued together.


(Tim Pierce) #2

You can make a temporary enclosure out of turkey roasting bags and a bit of tape. Also with the taz, you can bump the hotend temperature up another 5 degrees to get a better inter layer bond with ABS.


(Kevin) #3

Thanks @piercet It looks like I’ll need to start making profiles in the expert settings. I’ve gotten away with just using the quick print setting sup to this point.


(Mike Holden) #4

Hi, I’m Mike Holden, I designed n3m0. I’m interested to see how it works with the thrusters. We use 2 blue robotics thrusters on our larger boat (Dumbo).

It should be plenty of power, I’m not sure about the prop pitch or how fast you’ll go. We had a lot of trouble with little things getting stuck in Dumbo’s fans this last year but it was record runoff and SF bay was full of trash.

I think ABS is a good choice if you can get the prints to come out.

I’m glad you are documenting your build, I’ll update my instructions as you discover issues.


(Kevin) #5

Thanks Mike, and welcome. I like the two thrusters because I can set-up the software for either ArduSub or Rover with skid steer. I’ll work up some mounts that I can epoxy on the outside of the hull so I minimize hull penetrations. I was also thinking about having wires for the temperature sensor come down through the skeg and mounting it on the back end.

So the hull is finished, but I have some filling and sanding to do. The parts fit together really well and any of the errors you see are from the ABS warping. I’ll get a heat shield for the printer for Hull 02 and see if it does any better.


(Kevin) #6

So filling and sanding has been…fun. I used way too much Bondo and not coarse enough sandpaper so life was rough just returning the hull to it’s proper shape. I’ll have to find something better. Even worse was that I still had the errant leaks, so I covered the entire hull in yellow spray-on PastiDip. It’s waterproof now.

I got the thrusters attached and I’m working on the rest of the internals.


#7

Looks Nice. What did you use for glue?


(Kevin) #8

30 minute epoxy and then I hit the seams with ABS Glue. Plastistruct was what I had on hand.


#9

Thanks for the info… :wink: