{"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":9,"created_at":"2018-05-31T08:36:13Z","updated_at":"2018-06-03T13:42:58Z","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/394163335","html_url":"https://github.com/MarlinFirmware/Marlin/issues/10907#issuecomment-394163335","issue_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/10907","id":394163335,"node_id":"MDEyOklzc3VlQ29tbWVudDM5NDE2MzMzNQ==","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":"2018-06-03T13:42:58Z","updated_at":"2018-06-03T13:42:58Z","author_association":"NONE","body":"I will print the result. The position is the same as for the Z home. Center of the bed.\r\n\r\nThat phantom offset is maintained across the whole bed. So bed leveling is working in that the mesh is correct except for the offset.\r\n\r\nOne funny thing too happens when BILINEAR. Once it finished G29. If you do G1 Z0 at that last probe position it won't touch the bed, it will stay that 0.5 over the bed. That Offset again. I would think that at the probe position the nozzle should just be perfectly at Z0"}}
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