What length in pixels does a Wings3D unit of measurement equate to?

[micheus]

what means subdivision steps? what is it intended for?

It's equivalent to apply smooth to your model just before write the data to the STL file.
It's a common option in the other exporter dialogs - although I'm not sure it would be as so useful for models to be printed.

The current (and I think the final) layout to be proposed to the main devs is this one:


a) left, is equivalent to the current implementation: 1WU represents 1STL unit and the Export scale just represents a multiple of that.
b) right, is related to the meaning we gave to the 1WU when we modelled the object. With that information and the selection of the slicer tool we are going to export to, we get a computed scale that should make the slicer reproduce the object using the dimensions based on the meaning we used for Wings3D scale. (by supposing the slice will not auto-scale the model )

But, supposing that we still want to get our object printed with the double of the size, for instance, we can use that computed scale and multiply it by the desired factor. I put a note about that just below the table.

NOTE: Wings3D plugin automatically rotate the model around X axis to make the Y axis match with the Z axis at the 3D printer. That is why there is no option related to that in the dialog.

If someone want to test it and give me a feedback here is the link to download the patch. Use the option File->Install Plug-in or Patch in the main menu to "replace" the original one.