To start 3D printing or Laser Cutting, you'll need to create an account here. Once done, you'll be able to upload your files and get live quotes of yours parts
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To export your 3D file for 3D printing, go to the Output of the 3D model > More > Export model.
Right click and you will see a list of available formats you can choose to export your 3D model. Select to save your file in .STL format, as it is the best option for 3D printing.
Give a name to your file and save it on your computer.
As a matter of fact, once you upload it, it will look like this: