{"action":"created","issue":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/8743","repository_url":"https://api.github.com/repos/MarlinFirmware/Marlin","labels_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/8743/labels{/name}","comments_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/8743/comments","events_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/8743/events","html_url":"https://github.com/MarlinFirmware/Marlin/issues/8743","id":280849392,"number":8743,"title":"Unstable PID after autotune bugfix-2.0.x","user":{"login":"makz27","id":8807832,"avatar_url":"https://avatars2.githubusercontent.com/u/8807832?v=4","gravatar_id":"","url":"https://api.github.com/users/makz27","html_url":"https://github.com/makz27","followers_url":"https://api.github.com/users/makz27/followers","following_url":"https://api.github.com/users/makz27/following{/other_user}","gists_url":"https://api.github.com/users/makz27/gists{/gist_id}","starred_url":"https://api.github.com/users/makz27/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/makz27/subscriptions","organizations_url":"https://api.github.com/users/makz27/orgs","repos_url":"https://api.github.com/users/makz27/repos","events_url":"https://api.github.com/users/makz27/events{/privacy}","received_events_url":"https://api.github.com/users/makz27/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":4,"created_at":"2017-12-10T21:59:34Z","updated_at":"2017-12-13T18:08:50Z","closed_at":null,"author_association":"NONE","body":"### Bug Report\r\n- Description: Unstable PID even after multiple autopid\r\n- Expected behaviour: Stability of the temperature\r\n- Actual behaviour: The temperature start to oscillate before reaching temp & oscillate a lot even after multiple autotunes\r\n- Steps to reproduce:\r\n  - Turn ON\r\n  - M303 E0 S200 C8\r\n  - M301 Pxx Ixx Dxx\r\n  - M500\r\n  - Set temperature to 200°\r\n  - Watch the waves\r\n\r\n- Version : branch bugfix-2.0.x commit : 64d49a2\r\n\r\n[Configuration.zip](https://github.com/MarlinFirmware/Marlin/files/1546109/Configuration.zip)  \r\n(on this configuration i tried to set the PID_FUNCTIONAL_RANGE to 300 but same issue at the default value 10)\r\n\r\nI switched from Smoothieware to Marlin for a MKS Sbase.\r\n\r\nOn smoothieware, the first PID was successful, a very stable temperature for days (hotend & bed).  \r\nAt first i used the data from the smoothie firmware but it was not stable so i tried multiple autotunes with/without fan ect ... everytimes i get a unstable temperature\r\n\r\nHere the temperature oscillate between 180.5 and 184.8 for a target temperature at 180  \r\n![screenshot from 2017-12-10 22-56-39](https://user-images.githubusercontent.com/8807832/33809813-250628c4-ddfd-11e7-9807-f1b582c89e4f.png)\r\n"},"comment":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/comments/351474378","html_url":"https://github.com/MarlinFirmware/Marlin/issues/8743#issuecomment-351474378","issue_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/8743","id":351474378,"user":{"login":"makz27","id":8807832,"avatar_url":"https://avatars2.githubusercontent.com/u/8807832?v=4","gravatar_id":"","url":"https://api.github.com/users/makz27","html_url":"https://github.com/makz27","followers_url":"https://api.github.com/users/makz27/followers","following_url":"https://api.github.com/users/makz27/following{/other_user}","gists_url":"https://api.github.com/users/makz27/gists{/gist_id}","starred_url":"https://api.github.com/users/makz27/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/makz27/subscriptions","organizations_url":"https://api.github.com/users/makz27/orgs","repos_url":"https://api.github.com/users/makz27/repos","events_url":"https://api.github.com/users/makz27/events{/privacy}","received_events_url":"https://api.github.com/users/makz27/received_events","type":"User","site_admin":false},"created_at":"2017-12-13T18:08:50Z","updated_at":"2017-12-13T18:08:50Z","author_association":"NONE","body":"It's worst than before.\r\n\r\nBut my bed is just okay (with K1 back at 1) if go to my target temp as it should, just the hotend is stable (at 1 only, not stable at any value below 1) but always stay 1 or 2degree below the target and incrementing the I value make it worst."}}
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