{"action":"created","issue":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2040","labels_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2040/labels{/name}","comments_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2040/comments","events_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2040/events","html_url":"https://github.com/MarlinFirmware/Marlin/issues/2040","id":74585802,"number":2040,"title":"Homing & Leveling Bugs","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},"labels":[{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/labels/Needs%20feedback","name":"Needs feedback","color":"fbca04"},{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/labels/Needs%20more%20work","name":"Needs more work","color":"fbca04"},{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/labels/Verified%20bug!","name":"Verified bug!","color":"e11d21"}],"state":"open","locked":false,"assignee":null,"milestone":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/milestones/30","html_url":"https://github.com/MarlinFirmware/Marlin/milestones/Bug%20Fixing%20Round%207","labels_url":"https://api.github.com/repos/MarlinFirmware/Marlin/milestones/30/labels","id":1185098,"number":30,"title":"Bug Fixing Round 7","description":"","creator":{"login":"boelle","id":3832239,"avatar_url":"https://avatars.githubusercontent.com/u/3832239?v=3","gravatar_id":"","url":"https://api.github.com/users/boelle","html_url":"https://github.com/boelle","followers_url":"https://api.github.com/users/boelle/followers","following_url":"https://api.github.com/users/boelle/following{/other_user}","gists_url":"https://api.github.com/users/boelle/gists{/gist_id}","starred_url":"https://api.github.com/users/boelle/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/boelle/subscriptions","organizations_url":"https://api.github.com/users/boelle/orgs","repos_url":"https://api.github.com/users/boelle/repos","events_url":"https://api.github.com/users/boelle/events{/privacy}","received_events_url":"https://api.github.com/users/boelle/received_events","type":"User","site_admin":false},"open_issues":2,"closed_issues":2,"state":"open","created_at":"2015-06-29T11:57:38Z","updated_at":"2015-07-18T00:34:22Z","due_on":null,"closed_at":null},"comments":241,"created_at":"2015-05-09T04:44:44Z","updated_at":"2015-07-24T22:01:12Z","closed_at":null,"body":"We've gotten rid of a lot of little bugs in homing and leveling lately, but the current Development code still has an obscure Z positioning problem with `G29`. So, I've narrowed down the current leveling issues to a small handful of recent changes, and rolled back the leveling code to around March 26 at the branch https://github.com/thinkyhead/Marlin/tree/before_delta_merge\r\n\r\nThe differences between that code and the current leveling / homing code are embodied in commit https://github.com/thinkyhead/Marlin/commit/3f0a990360d04a45c11ba6ebdfeff2b16d26bf34 One of the changes in this commit is almost certainly responsible for the current weird behavior.\r\n\r\nSo, I suggest starting with [before_delta_merge](https://github.com/thinkyhead/Marlin/tree/before_delta_merge) to see if it behaves properly. Then we can try to determine which of those recent changes is responsible for any remaining problems.\r\n\r\nOnce these leveling bugs are squashed, we can close all these issues:\r\n\r\n#1507 #1833 #1844 #1894 #1701 #1730 #1731 #1737"},"comment":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/comments/124740113","html_url":"https://github.com/MarlinFirmware/Marlin/issues/2040#issuecomment-124740113","issue_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2040","id":124740113,"user":{"login":"Ziggy2013","id":3327724,"avatar_url":"https://avatars.githubusercontent.com/u/3327724?v=3","gravatar_id":"","url":"https://api.github.com/users/Ziggy2013","html_url":"https://github.com/Ziggy2013","followers_url":"https://api.github.com/users/Ziggy2013/followers","following_url":"https://api.github.com/users/Ziggy2013/following{/other_user}","gists_url":"https://api.github.com/users/Ziggy2013/gists{/gist_id}","starred_url":"https://api.github.com/users/Ziggy2013/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Ziggy2013/subscriptions","organizations_url":"https://api.github.com/users/Ziggy2013/orgs","repos_url":"https://api.github.com/users/Ziggy2013/repos","events_url":"https://api.github.com/users/Ziggy2013/events{/privacy}","received_events_url":"https://api.github.com/users/Ziggy2013/received_events","type":"User","site_admin":false},"created_at":"2015-07-24T22:01:12Z","updated_at":"2015-07-24T22:01:12Z","body":"*I don't think G28 and G29 should agree in general. *\r\n\r\nSo how should M206 work on the Z axis? Where is the Z=0 reference?"}}