I am new to the process of making a 3d object printable and using netfabb and these programs. The model i have built in minecraft. With the program mineways i have created the *.wrl file. Then with Meshlab converted to a *.stl file. This file uploaded to Shapeways. http://www.shapeways.com/model/452072/amphitheatrum_flavium_ __2004_cm____.html It seems to work. But a Customer Service Agent found some difficulties with the model. After i sent her the the models *.stl file. This is what she says: "As you can see on my attachments, you can see that these models are too small to be printed and there fore the wall thickness is also too thin. " - her picture: After her suggestion to use netfabb i get these informations: the model on the website http://www.shapeways.com/model/452072/amphitheatrum_flavium_ __2004_cm____.html Should i let someone try to purchase the model and see what shapeways says, if its printable or not ? But I would reluctantly make someone an offer that probably can not be met.