Here is a picture of a model I recently printed: I suspected the missing part of the chair was due to me messing up face orientation (and if I had looked closer at the Shapeways render I would have noticed a problem before printing), I beefed it up a little, and ran it through Meshlabs cloud service, and added a couple new chairs to another FUD model I was printing. This time I was told the chair back was too thin as it was made of thin wires. The question I posed to customer service, and didn't get a clear answer, is when if part of a structure a bunch of wires and when is it a wall with holes? I can make the chair back parts 50% bigger to make them legal wires, but it might look better if I made wider pieces. And pointing out that it printed before, apparently without problems, didn't help. I was pretty happy with the chair (except the missing piece) and was looking forward to getting a corrected version I could clean and paint. Any suggestions?