Monthly Archives: July 2011

What I learnt making a 3D printable AUV hull (Part 2)

I printed four copies of the semidemihemisphere and refined it a bit as I went.  Here’s the whole thing, including the hull that I covered in my last log entry.  The only difference in the hull is I removed the top hole, as only two of the semidemihemispheres need it (as valve mounting holes).

Tweaked version of the AUV model.

Tweaked version of the AUV model.

I made a few interesting changes to the cutaway portion though:

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What I learnt making a 3D printable AUV hull (Part 1)

I did a bit of testing on my AUV hull design, and finally got a prototype ready to go.  I’ve been working on the design for several months in Autodesk 123d, which is a pretty great program if you can put up with the crashes, corrupt save files, and slowness (hey, it’s beta).

Here is my current design in full, including the support structures:

Spherical Autonomous Underwater Vehicle hull

The 3D model for my spherical AUV hull.

This is one eighth of the hull; I call it a semidemihemisphere.  Eight of these will make a sphere 18 cm in diameter.  I split it up into eighths because I’m using a Makerbot 3D printer and its build platform is limited to a cube about 10 cm to a side.  Also, this way each piece can be identical (or nearly so).

One limitation in the Makerbot is that it can’t print overhangs very well, so I had to add some support structures that can be cut away.  In this entry I will ignore that and focus on the hull design:

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