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A similar method seems to be implemented in slic3r already, but direct firmware is maybe possible.

Required operations:

One would require the following float operations to have one additional split:

* for the knowledge if its a feature or not and splitting should be done : 4 subtractions + 2 multiplications. One global float cosFeatureAngle.

If splitting is to be performed:

* calculating the radius: one division, 2 additions, one multiplication one sqrt one division

* calculating the offset vector: 2 multiplications 1 divisions , 2 subtractions + 2 multiplications;

* calculating the new position M: 2 additions one multiply 2 additions

Total: 3 divs 8 mul 10 adds 1 sqrt ; if I count correctly.

Extrusion correction:

+ 1 vector length calculation |BM|==|MC|, one division.

+ one additional additive variable to the extrusion position.

Total: 1 divs 3 mul 3 adds 1 sqrt ; if I count correctly.

The whole thing would not only approximate arcs that span over multiple segments, but also would approximate splines by a local radius.

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