I would like to know the best way to make curves in models other than using a 3D modelling application. What plugins and features should I use? Currently Blender is most commonly what tends to be used from my perspective.
Example: 
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I would say, get comfortable with unions, and aligning cylinders to parts. It takes quite a bit of time to get used to, but it’s definitely an option.
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I highly recommend a plugin called “Archimedes Two”. Very straight forward and easy to use!
There’s also “CSG Curve Cutter”, but personally I barely use it, and it’s only for unions.
EDIT: Links >
https://www.roblox.com/catalog/144938633/Archimedes-Two-v2-4
https://www.roblox.com/library/377278481/CSG-Curve-Cutter
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I’ve tried CSG Curve Cutter, not a fan of it. Thanks guys.
This particular curvature is created quite simply by aligning a cylinder to each corner, as Fxuzy suggested - no plugin is necessary in this case.
The empty space should always be an even distance in either direction (i.e. 1x1, 1.5x1.5, 2x2).
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Ahh yes, I have done that before, but didn’t get the best results (for what I needed).