René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Unwanted cut if backtrack is used","articleBody":"I'm trying to get rid of an unwanted cut for a very simple test board.\r\nThe layout should look like this:\r\n![Screenshot 2023-04-30 at 16 30 45](https://user-images.githubusercontent.com/72009731/235358678-9717b58e-0a80-4a25-8147-1bf06ffc91d0.png)\r\n\r\n(screen shot of gerbv)\r\n\r\nThe gerber file looks very simple:\r\nG75*\r\n%MOIN*%\r\n%OFA0B0*%\r\n%FSLAX24Y24*%\r\n%IPPOS*%\r\n%LPD*%\r\n%AMOC8*\r\n5,1,8,0,0,1.08239X$1,22.5*\r\n%\r\n%ADD10C,0.0520*%\r\n%ADD11C,0.0157*%\r\nD10*\r\nX001500Y001500D03*\r\nX002500Y001500D03*\r\nX002500Y002500D03*\r\nX001500Y002500D03*\r\nD11*\r\nX002500Y002500D01*\r\nM02*\r\n\r\nWith pcb2gcode V 2.5.0 and the following parameters\r\npcb2gcode --zsafe 5 --zchange 100  --zwork -0.05 --zcut -1.8 --mill-diameters 0.2mm --cutter-diameter 2.4mm --mill-feed 200 --cut-feed 800 --mill-speed 20000 --cut-speed 16000  --front millTest2-2bot-traces-GERBER_RS274X-1.gerber  --basename millTest2-2bot-traces --metricoutput  --vectorial 1 --software mach3 --optimise 0 --eulerian-paths 0\r\n\r\nI got these cuts:\r\n\u003cimg width=\"344\" alt=\"image\" src=\"https://user-images.githubusercontent.com/72009731/235358825-dff46c64-4a2a-4f5a-ba2f-1d59e10e19a5.png\"\u003e\r\n\r\nOn the left hand side is the unwanted cut. Why is it there?\r\nIf I disable backtrack (using --backtrack 0) , it works fine:\r\n\r\n\u003cimg width=\"370\" alt=\"image\" src=\"https://user-images.githubusercontent.com/72009731/235358979-4478cec0-898a-4db0-a301-cd419b5fdf7b.png\"\u003e\r\n\r\nIs it a bug or a feature? For bigger designs, backtracking might be very useful. I don't like to disable it entirely.\r\n\r\nThank you\r\nTobias\r\n\r\n\r\n","author":{"url":"https://github.com/Tobias4git","@type":"Person","name":"Tobias4git"},"datePublished":"2023-04-30T14:41:57.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/667/pcb2gcode/issues/667"}