{"action":"created","issue":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/9418","repository_url":"https://api.github.com/repos/MarlinFirmware/Marlin","labels_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/9418/labels{/name}","comments_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/9418/comments","events_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/9418/events","html_url":"https://github.com/MarlinFirmware/Marlin/issues/9418","id":293382708,"number":9418,"title":"UBL jumping Z by huge amount in middle of mesh","user":{"login":"brookstalley","id":512114,"avatar_url":"https://avatars0.githubusercontent.com/u/512114?v=4","gravatar_id":"","url":"https://api.github.com/users/brookstalley","html_url":"https://github.com/brookstalley","followers_url":"https://api.github.com/users/brookstalley/followers","following_url":"https://api.github.com/users/brookstalley/following{/other_user}","gists_url":"https://api.github.com/users/brookstalley/gists{/gist_id}","starred_url":"https://api.github.com/users/brookstalley/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/brookstalley/subscriptions","organizations_url":"https://api.github.com/users/brookstalley/orgs","repos_url":"https://api.github.com/users/brookstalley/repos","events_url":"https://api.github.com/users/brookstalley/events{/privacy}","received_events_url":"https://api.github.com/users/brookstalley/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":4,"created_at":"2018-02-01T02:31:22Z","updated_at":"2018-02-01T15:52:07Z","closed_at":null,"author_association":"NONE","body":"### Bug Report\r\n- Description: After probing complete mesh, moves from some nodes to very close Z's result in huge Z axis jump\r\n\r\n- Expected behaviour: Z moves by 0.005mm\r\n- Actual behaviour: Z moves by ~5mm\r\n\r\nHere is my G29 T0 after moving to 175,140,5 (G1 X175 Y145 Z5):\r\n```\r\nREAD: Bed Topography Report:\r\nREAD: \r\nREAD: (0,6)                                           (6,6)\r\nREAD: (57,242)                                        (192,242)\r\nREAD:  -9.947   -9.931   -9.913   -9.909   -9.888   -9.889   -9.894  \r\nREAD:  -9.895   -9.869   -9.877   -9.852   -9.822   -9.853   -9.864  \r\nREAD:  -9.835   -9.842   -9.854   -9.816   -9.827   -9.802   -9.836  \r\nREAD:  -9.837   -9.856   -9.816   -9.805   -9.826  [-9.797]  -9.817  \r\nREAD:  -9.806   -9.858   -9.847   -9.853   -9.821   -9.848   -9.850  \r\nREAD:  -9.855   -9.850   -9.885   -9.883   -9.887   -9.879   -9.903  \r\nREAD:  -9.922   -9.935   -9.941   -9.943   -9.964   -9.934   -9.966  \r\nREAD: (57,12)                                            (192,12)\r\nREAD: (0,0)                                             (6,0)\r\nREAD: ok\r\n```\r\n\r\n...and then issuing a G1 X175 Y150 Z5 results in:\r\n```\r\nREAD: Bed Topography Report:\r\nREAD: \r\nREAD: (0,6)                                           (6,6)\r\nREAD: (57,242)                                        (192,242)\r\nREAD:  -9.947   -9.931   -9.913   -9.909   -9.888   -9.889   -9.894  \r\nREAD:  -9.895   -9.869   -9.877   -9.852   -9.822   -9.853   -9.864  \r\nREAD:  -9.835   -9.842   -9.854   -9.816   -9.827  [-9.802]  -9.836  \r\nREAD:  -9.837   -9.856   -9.816   -9.805   -9.826   -9.797   -9.817  \r\nREAD:  -9.806   -9.858   -9.847   -9.853   -9.821   -9.848   -9.850  \r\nREAD:  -9.855   -9.850   -9.885   -9.883   -9.887   -9.879   -9.903  \r\nREAD:  -9.922   -9.935   -9.941   -9.943   -9.964   -9.934   -9.966  \r\nREAD: (57,12)                                            (192,12)\r\nREAD: (0,0)                                             (6,0)\r\nREAD: ok\r\n```\r\n\r\n...but the Z axis has actually moved closer to the nozzle by about 5mm rather than the 0.005 that seems to be indicated.\r\n\r\nI have tried M111 S247 and the UBL leveling and G28 commands print debugging info, but this move does not.\r\n\r\n[configs.zip](https://github.com/MarlinFirmware/Marlin/files/1683974/configs.zip)\r\n\r\n\r\n"},"comment":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/comments/362308691","html_url":"https://github.com/MarlinFirmware/Marlin/issues/9418#issuecomment-362308691","issue_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/9418","id":362308691,"user":{"login":"brookstalley","id":512114,"avatar_url":"https://avatars0.githubusercontent.com/u/512114?v=4","gravatar_id":"","url":"https://api.github.com/users/brookstalley","html_url":"https://github.com/brookstalley","followers_url":"https://api.github.com/users/brookstalley/followers","following_url":"https://api.github.com/users/brookstalley/following{/other_user}","gists_url":"https://api.github.com/users/brookstalley/gists{/gist_id}","starred_url":"https://api.github.com/users/brookstalley/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/brookstalley/subscriptions","organizations_url":"https://api.github.com/users/brookstalley/orgs","repos_url":"https://api.github.com/users/brookstalley/repos","events_url":"https://api.github.com/users/brookstalley/events{/privacy}","received_events_url":"https://api.github.com/users/brookstalley/received_events","type":"User","site_admin":false},"created_at":"2018-02-01T15:52:07Z","updated_at":"2018-02-01T15:52:07Z","author_association":"NONE","body":"I’m probably missing something with config interactions. My Z_PROBE_OFFSET_FROM_EXTRUDER is -0.52, which is accurate as measured. UBL does work flawlessly except that back right corner.\r\n\r\nTurning UBL off, my correct M206 value is M206 Z9.9 ... should I be leaving that in place with UBL enabled, or setting it to 0 but adding 9.9 to Z_PROBE_OFFSET_FROM_EXTRUDER, or is there a better way to zero out the Z offset? \r\n\r\nThanks for the speedy reply and assistance!"}}
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