Preparing your file for 3D printing
You can scan or design an object to be printed using 3D modelling software. There are two computers in the MakerLab that can be used for 3D modeling, scanning, and editing using a number of software programs or by modifying a pre-existing design. In order to print your design, it should conform to the below standards.
Export your model as a stereolithography file, with an STL extension (.stl).
Maximum size is 300 x 300 x 450 mm (12 x 12 x 18 in). Layers must be at least 0.1 mm thick (0.020 in).
We only accept 3D print request submissions in millimeters. If you do not know how to change the units of your model, contact us or make a note in “Special Instructions” on the submission form.
The standard resolution is .2 mm per layer, with 10% infill. You can specify a different quality level by making a note under “Special Instructions” on the submission form.
If your model includes multiple parts we ask that you please save each part as a separate STL file and submit each file as a separate request.
The surface of your 3D model must be watertight. This means all faces of the object must construct one or more closed volume entities. Gaps or holes in the model will cause it to print incorrectly.
Your final model should not contain any 2D elements, as they can cause naked edge problems. Delete any 2D elements that were used to create sweeps, lofts, or other complex shapes.
Check your design for holes, gaps, or other problems before submission. Numerous third party tools can help you fix geometry problems, including:
NetFabb – free online service for checking and repairing 3D model files.
MeshLab – open source software for checking 3D mesh files.
Meshmixer – free software for editing and manipulating 3D mesh files.
Shapeways offers a tutorial for fixing and repairing 3D models using these services.
Common problems
Other things to be careful of when creating your model:
- Degenerate faces: Mesh faces that have 0 area.
- Zero length edges: Edges with no length, created by degenerate faces.
- Non manifold edges: Faces that have more than one face connected to a single edge.
- Naked edges: A surface or polysurface edge that is not connected to another edge.
- Duplicate faces: Identical faces in a single mesh.
- Faces should be flipped: The faces in a mesh object should point in a consistent direction.
- Disjoint pieces: Mesh objects that do not connect but are considered a single mesh.
Don’t know how to fix your model? Ask Us!