Your model space includes a bunch of 3DSolids and a block reference (named "back").
The block definition includes a bunch of 3DSolids and a bunch of 3DFaces. Which "wireframe" (AutoCAD doesn't know such an object) do you want to be converted to 3DSolid?
Guessing I think you want to have "converted" the content of the block definition (?).
If so, you find in the attached file a block "back-pa" which now includes one 3DSolid. In the modelspace I inserted a block reference "back-pa" and additional the new 3DSolid.
If I'm wrong please let us know what you really want to achieve.
Jürgen Palme
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