Designing For Plastic 3D Printing

3D printing lets you break most of the rules in traditional manufacturing processes, but there are a few guidelines that will help you optimize parts for this process.  


  • A flat base provides good adhesion to the print bed.
  • Use chamfers to connect overhangs to the base of the part(Note the tabs on this part print without support structures. The middle flange also has a 45 deg chamfer).
  • Use default infill settings.


Organic Shapes


  • Use chamfers on the base of the part to print without supports. (45 deg or less)
  • Fillets work great on top of the part.



Teardrop Shapes

Here's a detailed, cross-section view of the nacelle. Notice the internal wire channel. 


  • The teardrop shape is achieved with:
    • Flat bottom (for good bed adhesion)
    • 70 degree chamfer for the overhang (45 degree would print fine, but stall the airflow in quad copter).
    • Full round (fillet) for the top.
  • The internal wire channel has a 45 degree chamfer on top to close the cavity without supports.
  • Chamfer on the bottom of the wire channel to give wall thickness to the part, and increase strength. 



A few notes on Infill.

  • Eiger defaults to triangular type Fill Pattern due to the increased speed capabilities of triangular paths and the very little effect on part strength.
  • To achieve 100% infill (solid plastic), it is recommended to use rectangular Fill Patterns.