Experimental firmware release 1.17c+1
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Awesome David! Will give the newer FW a go now and let you know if all is good after I've tested a bunch of CW/CCW variations.
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After some testing it looks like we are on a winner. I may have mentioned that you probably need tests to make sure an arc does not drive the head out of the bed limits however in reality the part won't be outside of the bed limits in the first place. It's only when a rubbish arc call in the gcode can cause this. Up to you if you want to include that safeguard in the code?
Thanks again for making this work. My code to take visibly faceted curves on an object and smooth them out by replacing all the short lines with one arc call is coming along nicely. Here is a good example of a before and after using the code -
Still more work to do with complex objects before it is ready.