Should I include fillets on my 3d printed parts? A fillet is like a rounded corner but on the inside of the corner.



Does it make a difference (structurally) to use fillets on a 3d printed part?
If your part needs structural support, then the word is: absolutely. Fillets provide the added support when you need it. If your part has a meeting line which is sharp - 90° (or perpendicular), there is a natural stress riser in your design. This is a weak spot where a crack can form. If strength is needed and the fillet won't interfere with the design, it's definitely something you should include with your part.