Hi Involute,

"""""""""""I've used inches with them in the past with no problems, but perhaps I've just been lucky.""""""""""""""

Yeah, it was just a recommendation based on some issues I had. I was having some problems getting some models to load, with a "non-manifold" (Not a solid) report.. Although I was sure my model was manifold.. Researching with shapeways revealed there servers work in MM nativley, and my issues were solved by just uploading the same models in MM's. If you upload other units, their servers are dynamically converting the models, which in my case, was resulting in corrupting my solids... Havnt had any issues since, by using MM's as the unit to upload. FYI.