Shell refuses to work on my spheres

[kest_cesnavicius]

Good evening

Shell refuses to work on object with added spheres.  Error:   The operation could not create a valid result. Try adjusting the values or changing the inputs.  Tried to use shell at multiple point in multiple layers but can not be used after first sphere was added.

[jhackney1972]

You can use a different approach and get a shelled body.  This is a 2mm wall thickness.  Model is attached.

[kest_cesnavicius]

I see your strategy. Creating two surfaces. Except there is problem again. Ofset is only allowed up to 2.7mm while I need at least 3mm.

[TheCADWhisperer · Accepted solution]

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@kest_cesnavicius wrote:

 I need at least 3mm.

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@kest_cesnavicius 

If it were my design - I would start over to clean it up, but in any case - see Attached...

Oops, I forgot to make the component Active, but you get the idea.

I suspect the design technique could be significantly simplified.

A couple simple sketches.

A couple of Revolves and Loft.

Shell and done.

[kest_cesnavicius]

Thank you so much. I will do so 
Just started learning modeling after first 3D printer.