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For beginners, the first and easiest way to start 3D printing is to find a model that someone has already designed, download its file, and print it. The Projects and Resources page can help you locate files to print.
More advanced users may want to create their own 3D print models from scratch. This involves using software, and possibly a 3D scanner, to create a file the printer will understand.
Often, the cause of an unprintable 3D model is the surface thickness. If the surface is too thick, the model can break or crack from internal stress. If its too thin, the model will be extremely fragile.
DON'T ignore material guidelines
Each printing material has its own unique properties with varying flexibilities, smoothness, weight, and so on. Take this into consideration while designing and printing.
DO design large flat sides
Large and flat sides are easier for the printer and have better chances of success than curved or hanging edges.
DON'T design the object with small or curved sides
This will reduce the stability of the bottom later if a project is too thin or has too many curves.
DO follow software guidelines
Every software package for 3D modeling has at least a small difference among them. Follow the printer's specific software guidelines to get the best results.
DON'T forget to check the resolution
For a file to print correctly, the file needs to have a high-quality resolution for the best results.