GregValiant 1,455
@gr5 covered the Support Blocker / Mesh Modifier way to do it. I started wondering about making adjustments to STL files when you don't have the CAD model to work with. I drew a 1 x 1 x 1 block with a 1mm R fillet, brought it into Cura along with your SpeedBrake part, scaled it, placed it (the rotation is tough) and then sliced it. Nice.
As shown - I scaled the fillet model 3 x 3 x 25. It then has the effect of a 3mm R fillet. Using the fillet and a support blocker as @gr5 suggests (with the overlaps set to 100% infill (or lots of walls)) and I think the part would be about as good as it's going to get using FDM.
Attached you will find one fillet in kit form.
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gr5 2,295
Yes you can but I don't think it will be any stronger. Instead you should put a fillet in that crack. Tight inside angles put all the stress on one line of your part. with a tiny fillet it will spread the load more. Alternatively make the outside thicker (the thinnest dimension). The strength is cubed the width so 10% thicker gives you 1.1^3 or 33% more strength. Twice as thick is 8X stronger.
Anyway here's the answer to your question:
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