{"action":"created","issue":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/10907","repository_url":"https://api.github.com/repos/MarlinFirmware/Marlin","labels_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/10907/labels{/name}","comments_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/10907/comments","events_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/10907/events","html_url":"https://github.com/MarlinFirmware/Marlin/issues/10907","id":328044190,"node_id":"MDU6SXNzdWUzMjgwNDQxOTA=","number":10907,"title":"Auto Bed Leveling Z offset Problem","user":{"login":"wjax","id":309918,"node_id":"MDQ6VXNlcjMwOTkxOA==","avatar_url":"https://avatars0.githubusercontent.com/u/309918?v=4","gravatar_id":"","url":"https://api.github.com/users/wjax","html_url":"https://github.com/wjax","followers_url":"https://api.github.com/users/wjax/followers","following_url":"https://api.github.com/users/wjax/following{/other_user}","gists_url":"https://api.github.com/users/wjax/gists{/gist_id}","starred_url":"https://api.github.com/users/wjax/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/wjax/subscriptions","organizations_url":"https://api.github.com/users/wjax/orgs","repos_url":"https://api.github.com/users/wjax/repos","events_url":"https://api.github.com/users/wjax/events{/privacy}","received_events_url":"https://api.github.com/users/wjax/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":3,"created_at":"2018-05-31T08:36:13Z","updated_at":"2018-06-02T14:35:10Z","closed_at":null,"author_association":"NONE","body":"### Description\r\n\r\nAuto Bed Level always ends with a Z offset. In my case of around 0.5mm\r\n\r\n### Steps to Reproduce\r\n\r\nUploaded latest bugfix-1.1 from 30-05-2018\r\nInstalled BlTouch.\r\nConfigured AUTO_LINEAR\r\nConfigured ProbeZ Offset as -0.7mm. Tested as making G28 and then G1 Z0, the nozzle slightly touches the bed.\r\nDo G29 and wait for it to finish. \r\nWhen finished G1 Z0. Then I move the nozzle arbitrary and it seems to be fine. Nozzle distance to bed is almost 0 in all cases.\r\nDo M500.\r\nDo M501.\r\nG28\r\nM420 S1 and then G1 Z0.\r\nAt this point the nozzle is no more slightly touching the bed but 0.5mm over the bed. And this distance is maintained no matter where you go over the bed in XY.\r\n\r\nSame happens with BILINEAR and UBL. The difference is that with those, just after finishing the G29, the offset is already there. \r\n\r\nAs the offset is maintained over the whole bed and the Z motors are working while moving XY, it seems like a ... offset set by the maths or the firmware. Marlin is compensating right but 0.5mm off.\r\n\r\n#### Additional Information\r\n[Marlin.zip](https://github.com/MarlinFirmware/Marlin/files/2057394/Marlin.zip)\r\n![img_20180531_103204_1](https://user-images.githubusercontent.com/309918/40771709-5eb381aa-64be-11e8-8be4-4c6a4efbe0db.jpg)\r\n![img_20180531_103209_1](https://user-images.githubusercontent.com/309918/40771711-5ed277c2-64be-11e8-9f7a-f9dd32a0bc07.jpg)\r\n![img_20180531_103252_1](https://user-images.githubusercontent.com/309918/40771712-5ef436be-64be-11e8-94e4-4474d5355873.jpg)\r\n\r\n"},"comment":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/comments/394091832","html_url":"https://github.com/MarlinFirmware/Marlin/issues/10907#issuecomment-394091832","issue_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/10907","id":394091832,"node_id":"MDEyOklzc3VlQ29tbWVudDM5NDA5MTgzMg==","user":{"login":"wjax","id":309918,"node_id":"MDQ6VXNlcjMwOTkxOA==","avatar_url":"https://avatars0.githubusercontent.com/u/309918?v=4","gravatar_id":"","url":"https://api.github.com/users/wjax","html_url":"https://github.com/wjax","followers_url":"https://api.github.com/users/wjax/followers","following_url":"https://api.github.com/users/wjax/following{/other_user}","gists_url":"https://api.github.com/users/wjax/gists{/gist_id}","starred_url":"https://api.github.com/users/wjax/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/wjax/subscriptions","organizations_url":"https://api.github.com/users/wjax/orgs","repos_url":"https://api.github.com/users/wjax/repos","events_url":"https://api.github.com/users/wjax/events{/privacy}","received_events_url":"https://api.github.com/users/wjax/received_events","type":"User","site_admin":false},"created_at":"2018-06-02T14:35:10Z","updated_at":"2018-06-02T14:35:10Z","author_association":"NONE","body":"My bltouch is firmly attached to the mount (which I designed). Several tests one after the other shows the same results. The probe reading is always the same. Very stable.\r\n\r\nThe G1 Z0 is executed at the same point than the G28. Which in my case is in the center of the bed (Safe homing).\r\n\r\nAll tests are done with cold bed. But the result are the same in hot bed. However I know that I can't mix them.\r\n\r\nBe sure that there is something going on.\r\n\r\nI can record a video or Skype if anyone is interested"}}
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