FDM 3D Printing Physical Limitations
As a general rule, 3D printed models only retain ~40% strength in the Z axis due to layer adhesion.
Curved Surfaces on the Z axis aka "Salmon Skin"
Causes:
- Just like slicing an apple and putting those slices back together, FDM printing builds objects by layering plastic at set heights. Continuous curved surfaces are problematic in the Z axis.
Solutions:
- Use Adaptive Layer Heights
- Chamfers, not Fillets, on bottom layers.
EXAMPLE:
Overhangs
Cause:
- Gravity + Molten Plastic = issues
Solutions:
- 3D Printer Supports (see section of supports)
- Ensure the Model has no overhang greater than 45 degrees
EXAMPLE:
Printing in Thin Air
Cause:
- Gravity; Model has a region that is floating.
Solution:
- If this is necessary, the only solution is to use supports.
