This production stuff is all new to me, so bear with me…
I’m considering having an object I’ve designed cast in metal. I found a company online that can do it by first producing a Master Pattern in resin with a rapid prototyping machine. For this they require files in STL format. So I checked Blender’s export options and was happy to find it can export STL files.
I’ve only just done a quick STL export test by exporting Blenders default startup cube. When I imported the STL file back into Blender I had a close look to see if anything had changed from the original 6 quad mesh. I found that each quad had been converted to 2 triangles and every triangle had its own set of 3 verts.
I was able to return the object to its original 6 quads by selecting all the verts and then ‘Remove Doubles’ and then ‘Convert Triangles to Quads’. But I had to do ‘Convert Triangles to Quads’ twice for it to happen.
I don’t know if this will smooth out your mesh but it might be worth a try