{"action":"created","issue":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/8293","repository_url":"https://api.github.com/repos/MarlinFirmware/Marlin","labels_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/8293/labels{/name}","comments_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/8293/comments","events_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/8293/events","html_url":"https://github.com/MarlinFirmware/Marlin/issues/8293","id":271683672,"number":8293,"title":"UBL issue/probing air","user":{"login":"cdedwards","id":2271505,"avatar_url":"https://avatars3.githubusercontent.com/u/2271505?v=4","gravatar_id":"","url":"https://api.github.com/users/cdedwards","html_url":"https://github.com/cdedwards","followers_url":"https://api.github.com/users/cdedwards/followers","following_url":"https://api.github.com/users/cdedwards/following{/other_user}","gists_url":"https://api.github.com/users/cdedwards/gists{/gist_id}","starred_url":"https://api.github.com/users/cdedwards/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cdedwards/subscriptions","organizations_url":"https://api.github.com/users/cdedwards/orgs","repos_url":"https://api.github.com/users/cdedwards/repos","events_url":"https://api.github.com/users/cdedwards/events{/privacy}","received_events_url":"https://api.github.com/users/cdedwards/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":11,"created_at":"2017-11-07T01:53:21Z","updated_at":"2017-11-07T06:07:33Z","closed_at":null,"author_association":"CONTRIBUTOR","body":"I've been attempting to use UBL again and I'm thinking that these numbers are not good.. In fact, when I G29 P1, the probe never actually hits the bed. for some reason, I am about 10mm too high. I'm getting the same thing with G33 P1 though, so not sure where the issue comes in. I can print and actually get some really nice prints but this has me stumped.\r\n[Marlin.zip](https://github.com/MarlinFirmware/Marlin/files/1448393/Marlin.zip)\r\nfile included is actually a rar file since we can't upload them here.\r\n\r\n\r\nSENT: G29 T\r\nREAD: \r\nREAD: Bed Topography Report:\r\nREAD: \r\nREAD: (0,6)                                           (6,6)\r\nREAD: (-135,135)                                        (135,135)\r\nREAD:      .          .       8.321    8.152    8.735       .          .     \r\nREAD:  \r\nREAD:      .       10.610    8.201    7.945    8.764    8.221       .     \r\nREAD:  \r\nREAD:   8.235    8.646    8.507    8.449    8.033    8.241    8.209  \r\nREAD:  \r\nREAD:   8.345    8.096    8.015  [ 8.008]   8.645    7.896    7.506  \r\nREAD:  \r\nREAD:   8.260    8.284    8.395    2.419    8.027    8.114    7.633  \r\nREAD:  \r\nSENT: M105\r\nREAD:      .       8.059    8.310    8.290    8.212    2.116       .     \r\nREAD:  \r\nREAD:      .          .       7.693    7.844    8.098       .          .     \r\nREAD: (-135,-135)                                            (135,-135)\r\nREAD: (0,0)                                             (6,0)"},"comment":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/comments/342385177","html_url":"https://github.com/MarlinFirmware/Marlin/issues/8293#issuecomment-342385177","issue_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/8293","id":342385177,"user":{"login":"cdedwards","id":2271505,"avatar_url":"https://avatars3.githubusercontent.com/u/2271505?v=4","gravatar_id":"","url":"https://api.github.com/users/cdedwards","html_url":"https://github.com/cdedwards","followers_url":"https://api.github.com/users/cdedwards/followers","following_url":"https://api.github.com/users/cdedwards/following{/other_user}","gists_url":"https://api.github.com/users/cdedwards/gists{/gist_id}","starred_url":"https://api.github.com/users/cdedwards/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cdedwards/subscriptions","organizations_url":"https://api.github.com/users/cdedwards/orgs","repos_url":"https://api.github.com/users/cdedwards/repos","events_url":"https://api.github.com/users/cdedwards/events{/privacy}","received_events_url":"https://api.github.com/users/cdedwards/received_events","type":"User","site_admin":false},"created_at":"2017-11-07T06:07:33Z","updated_at":"2017-11-07T06:07:33Z","author_association":"CONTRIBUTOR","body":"umm problem is not the sensor.  sensor is not even triggering at all. I've been getting very good results with my DC42 IR sensor. std dev was 0.09 or so over 40 taps on the bed according to M48\r\n"}}
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