Hi Eric,
You can actually have the Lamp work "as is" for uploading to shapeways:
What you will need to do is just before you create your stl, switch the system units to "Millimeters" then export your stl and upload it to shapeways.
Shapeways servers run and convert everything in Meters and the issue with inches is prevalent. You can do the conversion without affecting anything about the size and quality of your model.
Burr
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