{"action":"opened","issue":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/6742","repository_url":"https://api.github.com/repos/MarlinFirmware/Marlin","labels_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/6742/labels{/name}","comments_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/6742/comments","events_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/6742/events","html_url":"https://github.com/MarlinFirmware/Marlin/issues/6742","id":228770227,"number":6742,"title":"Head crash when using auto-bed leveling","user":{"login":"Adirael","id":27828,"avatar_url":"https://avatars3.githubusercontent.com/u/27828?v=3","gravatar_id":"","url":"https://api.github.com/users/Adirael","html_url":"https://github.com/Adirael","followers_url":"https://api.github.com/users/Adirael/followers","following_url":"https://api.github.com/users/Adirael/following{/other_user}","gists_url":"https://api.github.com/users/Adirael/gists{/gist_id}","starred_url":"https://api.github.com/users/Adirael/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Adirael/subscriptions","organizations_url":"https://api.github.com/users/Adirael/orgs","repos_url":"https://api.github.com/users/Adirael/repos","events_url":"https://api.github.com/users/Adirael/events{/privacy}","received_events_url":"https://api.github.com/users/Adirael/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2017-05-15T16:25:00Z","updated_at":"2017-05-15T16:25:00Z","closed_at":null,"body":"I can't figure out how to get bed leveling to work. I'm using an IR probe as a Z_MIN endstop, it triggers when the head is 1.35mm away from the glass and using it as a Z endstop works fine, but when I send a G29 the head crashes into the bed when the print starts. \r\n\r\nIt should be something wrong with my config, since the head goes just 1.35mm too dep and my leveling grid looks alright.\r\n\r\nThese are my config values and the leveling grid I get\r\n\r\n````\r\nBilinear Leveling Grid:\r\n       0      1      2      3\r\n  0 +0.043 +0.201 +0.289 +0.304\r\n  1 +0.069 +0.206 +0.298 +0.228\r\n  2 +0.091 +0.277 +0.372 +0.233\r\n  3 +0.135 +0.257 +0.258 +0.223\r\n````\r\n\r\nIf I'm missing some relevant value just let me know\r\n````\r\n#define X_PROBE_OFFSET_FROM_EXTRUDER 12     // X offset: -left  +right  [of the nozzle]\r\n#define Y_PROBE_OFFSET_FROM_EXTRUDER 0      // Y offset: -front +behind [the nozzle]\r\n#define Z_PROBE_OFFSET_FROM_EXTRUDER -1.35  // Z offset: -below +above  [the nozzle]\r\n\r\n#define Z_CLEARANCE_DEPLOY_PROBE   0 // Z Clearance for Deploy/Stow\r\n#define Z_CLEARANCE_BETWEEN_PROBES 0 // Z Clearance between probe points\r\n\r\n#define X_MIN_POS 0\r\n#define Y_MIN_POS 0\r\n#define Z_MIN_POS 0\r\n#define X_MAX_POS 170\r\n#define Y_MAX_POS 180\r\n#define Z_MAX_POS 155\r\n\r\n#define AUTO_BED_LEVELING_BILINEAR\r\n\r\n#define GRID_MAX_POINTS_X 4\r\n#define GRID_MAX_POINTS_Y GRID_MAX_POINTS_X\r\n\r\n#define LEFT_PROBE_BED_POSITION 15\r\n#define RIGHT_PROBE_BED_POSITION 160\r\n#define FRONT_PROBE_BED_POSITION 20\r\n#define BACK_PROBE_BED_POSITION 160\r\n````\r\n\r\nThanks for reading!"}}
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