{"action":"created","issue":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/5081","repository_url":"https://api.github.com/repos/MarlinFirmware/Marlin","labels_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/5081/labels{/name}","comments_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/5081/comments","events_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/5081/events","html_url":"https://github.com/MarlinFirmware/Marlin/issues/5081","id":184950504,"number":5081,"title":"G29 seems to work incorrect","user":{"login":"mgroene","id":3868450,"avatar_url":"https://avatars.githubusercontent.com/u/3868450?v=3","gravatar_id":"","url":"https://api.github.com/users/mgroene","html_url":"https://github.com/mgroene","followers_url":"https://api.github.com/users/mgroene/followers","following_url":"https://api.github.com/users/mgroene/following{/other_user}","gists_url":"https://api.github.com/users/mgroene/gists{/gist_id}","starred_url":"https://api.github.com/users/mgroene/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mgroene/subscriptions","organizations_url":"https://api.github.com/users/mgroene/orgs","repos_url":"https://api.github.com/users/mgroene/repos","events_url":"https://api.github.com/users/mgroene/events{/privacy}","received_events_url":"https://api.github.com/users/mgroene/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":8,"created_at":"2016-10-24T20:47:30Z","updated_at":"2016-10-25T15:32:54Z","closed_at":null,"body":"Hi, \r\ncurrently using Marlin RCbugFix from 2.Oct.16 on my printer. I always felt that the bed leveling not seems to work properly, since the distance of the nozzle is not really constant over the plate.\r\nAfter reading the post from szafran81 in #4995 I tested with an unlevelled bed. He felt that the correction is made in the wrong direction, which is not true for me, but something other strange happens.\r\nSee video: http://sendvid.com/xra8c8e3\r\n\r\nThe bed was leveled, reported with\r\n> Recv: G29 Auto Bed Leveling\r\n> Recv: Bilinear Leveling Grid:\r\n> Recv:       0     1     2\r\n> Recv:   +2.40 +0.08 -2.66\r\n> Recv:   +2.61 +0.25 -2.47\r\n> Recv:   +2.58 +0.36 -2.27\r\n\r\nIf making 10mm moves, there is a huge jump in z. Demanding 100mm moves this is not happening. Of course it should never happen? Any idea what to test or what might be wrong?\r\n\r\n"},"comment":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/comments/256070667","html_url":"https://github.com/MarlinFirmware/Marlin/issues/5081#issuecomment-256070667","issue_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/5081","id":256070667,"user":{"login":"Roxy-3D","id":8404322,"avatar_url":"https://avatars.githubusercontent.com/u/8404322?v=3","gravatar_id":"","url":"https://api.github.com/users/Roxy-3D","html_url":"https://github.com/Roxy-3D","followers_url":"https://api.github.com/users/Roxy-3D/followers","following_url":"https://api.github.com/users/Roxy-3D/following{/other_user}","gists_url":"https://api.github.com/users/Roxy-3D/gists{/gist_id}","starred_url":"https://api.github.com/users/Roxy-3D/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Roxy-3D/subscriptions","organizations_url":"https://api.github.com/users/Roxy-3D/orgs","repos_url":"https://api.github.com/users/Roxy-3D/repos","events_url":"https://api.github.com/users/Roxy-3D/events{/privacy}","received_events_url":"https://api.github.com/users/Roxy-3D/received_events","type":"User","site_admin":false},"created_at":"2016-10-25T15:32:53Z","updated_at":"2016-10-25T15:32:53Z","body":"It would be good to turn on the Communication Debug in PronterFace and duplicate that big Z-Raise.   I don't have any facts to back up this hunch, but I've seen this kind of thing a number of times.   What I'm curious about is:   What is the final coordinate you are moving to when you see the big Z-Raise?    I'm thinking it might be off the bed (and therefor, outside of the mesh).   \r\n\r\nIf you cant get a record of what is being sent to Marlin via the Communication Debug in Pronterface, you can do it the hard way and send G1 X50 Y50   followed by G1 X100, Y100 followed by G1 X160 Y160 followed by G1 X170 Y160  followed by G1 X180 Y160  etc.   until you get to where it happens.\r\n"}}
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