Hi,

the "hollow" keyword makes a shape hollow. My suggestion is, to make it
possible to add behind this keyword a small number that specifies a
"wall thickness".

Example:

sphere
{
 0.0, 1.0
 hollow 0.05
 ...
}

This would make the sphere hollow but keeps an inner wall thickness of
0.05 units.

Such a new way to specify wall thickness could make it easier than the
"difference" method, to get complicated shapes becoming hollow.

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