I do not have the answer (I don't use Blender) but I can reformulate the question. The problem is, in Blender, is the number of polygons the same as the number of

**triangles**. That is: are you making your models out of triangles or out of quads or even more complex polygons?

The Shapeways's 500k limit applies to triangles because the STL format convert all the polygons into triangles.

A way to understand if your modelling tool is displaying the number of triangles or the number of polygons is to compare this number to the number of vertices.

- If the numbers are of the

**same** magnitude then the odds are high that you've got a number of

**triangles**.

- If the number of polygons is roughly

**half** the number of vertices then it is very likely that you got the number of polygons and that those polygons are

**quads**.

- If the number of polygons is even

**lower than half** then those polygons are

**more complex than quads** and are definitively not triangles

This is because of the

Euler characteristic.

I hope someone knowing Blender can answer more precisely to your question...