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it's something in your file for sure, even using other tools from my library it repeats the issue. 

Deriving a 3D contour with a 5. stepdown is also allowed. 

Was this made from a template? I wonder if somehow you overrode the part of the expression that checks against ToolFluteLength

Math.min(tool_fluteLength * 0.75; tool_diameter * 2.5)

Please click "Accept Solution" if what I wrote solved your issue!