¶ Fillets in 3D Printing
¶ Overview
Fillets in 3D printing refer to the curved transitions between surfaces. They're key for enhancing object strength and aesthetics but can pose specific challenges, particularly when printed in certain orientations.
¶ Issue with Fillet Orientation and Variable Angles
The orientation of fillets during printing is crucial. While horizontal fillets typically print without issues, vertical fillets can cause problems, especially when the curved part faces downwards towards the print bed. This orientation can lead to variable angles where layers extend significantly over the previous one, creating print difficulties due to inadequate support.
Additionally, the area in close proximity to the heated printbet is more hot, causing additional issues with overhangs.
¶ Solutions
To address these orientation and angle-related challenges, the following strategies are recommended:
¶ Chamfers
- Replace problematic fillets with chamfers for consistent layer structure.
¶ Layer Height Adjustment
- Reduce layer height for better resolution in steep angle areas.
¶ Print Orientation
- Adjust the print orientation to ensure fillets are either horizontal or facing upwards, avoiding downward-facing curves.
¶ Asymmetric Fillets
- Use asymmetric fillets that stop at a maximum overhang angle (e.g., 70°) to minimize steep overhangs.
- The easiest way to do this is to champfer the Part and then fillet the top corner:
Comparison between a full bottom fillet and an asymmetric fillet:
