Turning closed hollow object to solid from imported stl file?

[Anonymous]

I have an stl file of an object that is hollow inside the fin (in the stl file attached). I was wondering how I would edit this in fusion so that the whole thing is a filled solid object? Thank you. 

[etfrench]

I think it has too many facets for Fusion 360.  You may want to try editing it in MeshMixer.

[ToddHarris7556]

Agree with @etfrench... Meshmixer is probably the best tool to address this. It's not the most user-friendly thing in the world, but it's powerful and gets the job done.

If you open the mermaid in MM, the first thing to do is use the Analysis>Inspector to identify and repair any mesh issues (there are a few, but the Inspector does a nice job of fixing them). 

Second, use Edit>Make Solid to mill in the hollow bits. I don't know what your needs are re: resolution on the scales, so you'll have to play a bit with the settings until you get something acceptable. The scales do increase the poly count, but they're really not THAT bad. The lighter weight you can make it (i.e. lower poly count) the happier Fusion will be.

Last will be to export the new solid that you've created as a new STL. 

[TrippyLighting]

In general, if you are "just" into into 3D printing this and other .stl files then as other have commented Fusion 360 is not the right tool for it.

If you are interested in how to create such objects as the mermaid tail with the scales from scratch Fusion 360 still is not the right software. There are plenty of options if you are wiling to spend money, however if you are looking for a free tool the Blender is a Sub-D modeler that will over you plenty of modeling ability for such organic objects.