> Alternatively you could use Designspark Mechanical, draw a 2D
> surface

Thanks. It's not urgent by any means so I'll have a look at whatever
is mentioned. Mostly of course I just want to avoid starting with
something that someone knows is a dog

He did quickly show me how I might do it at

https://www.tinkercad.com/

and

http://www.thingiverse.com/

so I've signed into those. It's more 3D modelling rather than what I
need to do but it won't hurt to have a play. As price and availability
of 3D printers comes down it's certain I'll be using one again

Joe


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