OpenSCAD trick - negative rounding

OpenSCAD pins with positive and negative chamfer

Somehow, OpenSCAD has become my main 3D modeling program. It’s incredibly powerful for parametric models but it’s also brain-intensive. I speed up development with the BOSL2 library. Many BOSL2 objects have built-in rounding features so I don’t need to invoke minkowski().

A trick with BOSL2 is negative rounding. Instead of cutting a corner, it makes the corner stick out. This is very useful for smoothing sharp edges, tapering pin holes, and generally filleting odd shapes. Make an object with negative rounding/chamfer, then use it to cut another object with subtract().

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