Lol, ok I've gotta say - most of that went totally over my head Rob
I think I understand what you're saying though.
If I've got it right, then I think the STL format is a poly line format (everything's made of triangles). So what I've done is just exported from Solidworks in STL but with the detail turned right up (shed loads of very very small triangles, smaller than a 3D printer would be able to cope with anyway - about 20Mb STL file in the end!).
Here's my finished wegu pad spacer... Not overly happy with the location of the screw holes, but they had to be in those places to fit my rifle correctly.
Finished rendering attached with a liberal sprinkling of fillets and a smattering of chamfers thrown in for good measure
Just need to get a price quote from the print agency now
I'm guessing with the swept volume, about £11 but they're sometimes a bit vague about their pricing policy so who knows.