{"action":"created","issue":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/4518","repository_url":"https://api.github.com/repos/MarlinFirmware/Marlin","labels_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/4518/labels{/name}","comments_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/4518/comments","events_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/4518/events","html_url":"https://github.com/MarlinFirmware/Marlin/issues/4518","id":169053636,"number":4518,"title":"RC6-RC7 moving zero point when printing on CoreXY","user":{"login":"PeetKos","id":19292064,"avatar_url":"https://avatars.githubusercontent.com/u/19292064?v=3","gravatar_id":"","url":"https://api.github.com/users/PeetKos","html_url":"https://github.com/PeetKos","followers_url":"https://api.github.com/users/PeetKos/followers","following_url":"https://api.github.com/users/PeetKos/following{/other_user}","gists_url":"https://api.github.com/users/PeetKos/gists{/gist_id}","starred_url":"https://api.github.com/users/PeetKos/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/PeetKos/subscriptions","organizations_url":"https://api.github.com/users/PeetKos/orgs","repos_url":"https://api.github.com/users/PeetKos/repos","events_url":"https://api.github.com/users/PeetKos/events{/privacy}","received_events_url":"https://api.github.com/users/PeetKos/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/labels/Bug:%20Potential%20?","name":"Bug: Potential ?","color":"eb6420"},{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/labels/Needs:%20Feedback","name":"Needs: Feedback","color":"fbca04"}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":13,"created_at":"2016-08-03T05:51:17Z","updated_at":"2016-08-08T02:10:56Z","closed_at":null,"body":"Hello!   \r\nwhen  I print   on   RC5     all  work ok,  but I  need  new version to use some future.  \r\n\r\non the foto    from  left to  right    printed 1\" cube\r\n1. RC5 single perimetr 0-infill\r\n2. RC7 single perimetr 0-ifill\r\n3. RC7 single  20%-infill   \r\n\r\nafter  printed    i   use  G1 X0   comand  and see    that    10mm   gap  from  endstop\r\n\r\nI  use hand made   printer   with  external 6600    drivers    NEMA23  motor,   on  RC5   all   work ok.\r\nI try    to   lower  speed and acceleration  -     same result  \r\nalso i try  to   change     adv.config \r\n/ By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.\r\n```cpp\r\n#define INVERT_X_STEP_PIN false\r\n#define INVERT_Y_STEP_PIN false\r\n```\r\n in result     zerro  point      move     in other   direction     (before  its move  to   X- Y+      and after   its move  to y+ only)\r\n\r\nand   again   in  RC5   I have't   that problem  at all     only  in RC6  and RC7\r\n  \r\n\r\n\r\n\r\n![20160803_022139](https://cloud.githubusercontent.com/assets/19292064/17354806/a2debd08-596d-11e6-99a4-97456d4df10b.jpg)\r\n"},"comment":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/comments/238126913","html_url":"https://github.com/MarlinFirmware/Marlin/issues/4518#issuecomment-238126913","issue_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/4518","id":238126913,"user":{"login":"thinkyhead","id":698003,"avatar_url":"https://avatars.githubusercontent.com/u/698003?v=3","gravatar_id":"","url":"https://api.github.com/users/thinkyhead","html_url":"https://github.com/thinkyhead","followers_url":"https://api.github.com/users/thinkyhead/followers","following_url":"https://api.github.com/users/thinkyhead/following{/other_user}","gists_url":"https://api.github.com/users/thinkyhead/gists{/gist_id}","starred_url":"https://api.github.com/users/thinkyhead/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/thinkyhead/subscriptions","organizations_url":"https://api.github.com/users/thinkyhead/orgs","repos_url":"https://api.github.com/users/thinkyhead/repos","events_url":"https://api.github.com/users/thinkyhead/events{/privacy}","received_events_url":"https://api.github.com/users/thinkyhead/received_events","type":"User","site_admin":false},"created_at":"2016-08-08T02:10:56Z","updated_at":"2016-08-08T02:10:56Z","body":"@PeetKos Please post the GCode you're printing. I can see no difference between RC5 and RC6 that should be specifically affecting CoreXY. In particular, neither the stepper or planner code was altered very much. While the `st_set_position` function did gain CoreXY support, it is not usually something that gets called in the middle of a print job.\r\n\r\nThe fact that you get a normal looking print with no infill, but a slanted print with infill leads me to think there might be a slipping belt, lost steps, or other mechanical failure due to changing direction at high speed. To eliminate this possibility, try setting your `DEFAULT_XYJERK` to a lower value, such as 10, and see if it has any positive effect on printing with `RC7` or `RCBugFix`. Or, just try printing very slowly, and see if it still produces a slanted print or screwed-up X position."}}
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