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Use knurled_cyl() module, you need a hole, set this value to zero. ScrewHoleDiameter = 3; // Number of indenting cones. ≥30 means "round, using current quality setting". Sphere_indents_faces = 16; // Bottom radius of the main (cylindrical or conical) knob shape, without the stem. ≥30 means "round, using current quality setting". // Depth of the.