Problems with a half-torus
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Very good. I wish I could make these things look harder to do than they are so those who've been struggling for hours wouldn't feel like they'd wasted a bunch of time.
Last Saturday, late in the afternoon, I showed a fellow how to do something he'd been struggling with since about 6 that morning. He hadn't even gotten dressed at the point I spoke to him. It took less than 30 seconds to draw what he wanted. I couldn't figure out how to make it go slower. 
It looks like you've got something weird going on with your torus. Maybe an extra circle drawn slightly off axis. It may not cause problems for your application but it isn't very clean the way it is.
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If you didn't wind up with any holes after running Follow Me, it isn't too small. Until you get used really familiar with SketchUp's handling of tiny edges and faces, the best thing is to try it and see what happens. You can always use Undo and then scale up to try again. With time you'll be able to anticipate that and be proactive.
When I am drawing small items and expect holes, I make a component of all the involved geometry--Follow Me path and profile, for example--and make a copy which I scale up. Then I edit the scaled up copy and run Follow Me or make intersections or whatever. When I'm finished, I exit the component, delete the big one and return to the original one which is sitting where I left it.
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I was putting some measurements on and the 'Spinning Beachball of Death' appeared, my component has disappeared from my computer
I have sent an error report. -
I wonder why that happened.
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Well it's back and better than ever
And when it cropped up in conversation yesterday my friend told me his brother has a 3D printer, so he can print it - perfect. Just need to figure out how to make the stl file converter plugin work now. 
It came to me, you just attach the .skp file...
If anyone wants to run an eye over it for errors at the 3D printing stage I'd be much obliged -
@tig said:
Extra tips:
Model so the faces' fronts are 'outwards' - context-menu 'reverse'...
Depending on the Style settings the front color is generally 'off-white' and the back color 'bluish' - your faces look like 'backs'...I have reversed the face of the bell if that's what you mean TIG:
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It's not a solid (no thickness , internal faces, ...) so you will not be able to print it with a 3d printer.
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@teig said:
If anyone wants to run an eye over it for errors at the 3D printing stage I'd be much obliged
I had a quick look...your model needs to be "Solid" to be 3D printable. Right now, you have a bunch of single-face walls with no thickness that will not print. You have to actually create the desired wall thickness for it to print properly.
See this link and my attachment for more details: http://www.dummies.com/how-to/content/understanding-solid-objects-in-google-sketchup-8.html
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@d12dozr said:
@teig said:
If anyone wants to run an eye over it for errors at the 3D printing stage I'd be much obliged
I had a quick look...your model needs to be "Solid" to be 3D printable. Right now, you have a bunch of single-face walls with no thickness that will not print. You have to actually create the desired wall thickness for it to print properly.
See this link and my attachment for more details: http://www.dummies.com/how-to/content/understanding-solid-objects-in-google-sketchup-8.html
I see what you mean. Sort of. Until you pointed it out I thought the area under the bellmouth was solid: how can I make it solid? I just know the push/pull of Follow tool will be a nightmare...
I don't/ can't see what the internal face is that I need to delete?
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Teig, the bottom of the bell was likely not formed when performing the follow me operation at too small of a scale.
Does the center have a hole like a donut? Assuming so, here's how I'd make the overall shape:
After you run the follow me tool, you're left with a solid that you can add the bottom holes to.
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Aaaah, you have saved as 2015!
So owners of other versions can't reload your file!
It's so easy to save as V6 for a more large audience! -
Gotcha! I think! Draw the profile at the very start. I've been trying for three hours now to put an arc under the bellmouth!
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@pilou said:
Aaaah, you have saved as 2015!
So owners of other versions can't reload your file!
It's so easy to save as V6 for a more large audience!Oops!
I'll try again with an older version. -
Pilou,it's long past time for you to catch up to the rest of the world.
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@dave r said:
Pilou,it's long past time for you to catch up to the rest of the world.
Pilou, doesn't your computer run 2015? Before I even start using some versions, I get a copy of the latest just so I can open files from others (and also to try it out some). I then back-save a file myself if I really want to play with it, using my current plugin and setup.
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@teig said:
I've been trying for three hours now to put an arc under the bellmouth!
You could use JointPushPull plugin to thicken a curved surface, but starting with a new profile is much cleaner and probably faster.
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I eventually got it sorted (hope), thanks to you folks. It really does look like the perfect bellmouth now - I couldn't sleep last night I was so excited
I'm at work now; I'll put the (v6) .skp up later.
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Nice!
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Nearly there...
I purged the model [Model Info > Statistics...]
I erased all guides.
I then regrouped the geometry.
It reported as a non-solid.
I suspected some un-faced edge[s] have been left hanging around...
I ran SolidSolver on it and it removed some 101 Un-faced or Coplanar edges.
Then it reported as a solid.
Simply using CleanUp would probably have made it a solid too...It is now suitable for 3d printing...
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I know it's not sensational or a spectacular Sketchup item but it's big to me
Here it is in all its glory:It's not solid and I don't know why, its in 4506 'entities'! I'm not bothering with the vents and mounting holes now; I can do them later on the milling machine and lathe, what does it need for 3D printing?
I've added the rounded lip on the edge of the bell mouth as an afterthought but I can't get rid of the joining lines; how do erase them?
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