Strange geometry on small arc moves

Hi, I've been experimenting with G-code that uses G2/G3 arc moves, and it generally works fine on Repetier Firmware except for very small radii (under a couple of mm, it seems). Then the geometry becomes like a coarse polygon with edges that extend a couple of mm outside the expected radius of the arc or circle. Any thoughts on what's going on? I can try and print and scan some test parts if you need to see more clearly what's happening, though it's a little tricky with such small moves as the filament doesn't track the toolpath very precisely. Thanks!


  • Resolution for small arcs is reduced as 3d printers can not follow that correct anyway. You can change the segments per circle by defining

    #define MM_PER_ARC_SEGMENT 1
    #define MM_PER_ARC_SEGMENT_BIG 3
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