{"action":"created","issue":{"url":"https://api.github.com/repos/repetier/Repetier-Firmware/issues/353","labels_url":"https://api.github.com/repos/repetier/Repetier-Firmware/issues/353/labels{/name}","comments_url":"https://api.github.com/repos/repetier/Repetier-Firmware/issues/353/comments","events_url":"https://api.github.com/repos/repetier/Repetier-Firmware/issues/353/events","html_url":"https://github.com/repetier/Repetier-Firmware/issues/353","id":55215704,"number":353,"title":"Repetier 0.92 - Negative missed steps?","user":{"login":"sigma957","id":10485262,"avatar_url":"https://avatars.githubusercontent.com/u/10485262?v=3","gravatar_id":"","url":"https://api.github.com/users/sigma957","html_url":"https://github.com/sigma957","followers_url":"https://api.github.com/users/sigma957/followers","following_url":"https://api.github.com/users/sigma957/following{/other_user}","gists_url":"https://api.github.com/users/sigma957/gists{/gist_id}","starred_url":"https://api.github.com/users/sigma957/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sigma957/subscriptions","organizations_url":"https://api.github.com/users/sigma957/orgs","repos_url":"https://api.github.com/users/sigma957/repos","events_url":"https://api.github.com/users/sigma957/events{/privacy}","received_events_url":"https://api.github.com/users/sigma957/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":7,"created_at":"2015-01-22T22:05:25Z","updated_at":"2015-01-25T16:23:02Z","closed_at":null,"body":"Hi,\r\n\r\nMy setup is: KosselXL (250x320mm) with Repetier 0.92 on Due + RADDS, 0.9 steppers, 16 microsteps, 40mm/s print speed, 60mm/s travel speed. Stepper high delay is set to 2, doubler frequency to 90kHz.\r\n\r\nI'm fighting positioning inconsistencies which make my first layer stick poorly or not stick at all.\r\nI have problems calibrating the center position as well (G132) - it always returns different results and therefore cannot print over radius greater than 30mm. Also I cannot level the bed properl (G29/G32), although I have installed 3 FSR sensors connected to JohnSL's FSR endstop.\r\n\r\nAfter deciding to track it down to the root cause I switched on DEBUG_STEPCOUNT. Not surprisingly I saw missed steps reported. What puzzles me is that the firmware reports negative missed steps in the communication stream.\r\n\r\nCould someone please explain what this means? I need to understand this better before I continue my search for the root cause.\r\n\r\nThanks in advance.\r\n"},"comment":{"url":"https://api.github.com/repos/repetier/Repetier-Firmware/issues/comments/71379570","html_url":"https://github.com/repetier/Repetier-Firmware/issues/353#issuecomment-71379570","issue_url":"https://api.github.com/repos/repetier/Repetier-Firmware/issues/353","id":71379570,"user":{"login":"sigma957","id":10485262,"avatar_url":"https://avatars.githubusercontent.com/u/10485262?v=3","gravatar_id":"","url":"https://api.github.com/users/sigma957","html_url":"https://github.com/sigma957","followers_url":"https://api.github.com/users/sigma957/followers","following_url":"https://api.github.com/users/sigma957/following{/other_user}","gists_url":"https://api.github.com/users/sigma957/gists{/gist_id}","starred_url":"https://api.github.com/users/sigma957/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sigma957/subscriptions","organizations_url":"https://api.github.com/users/sigma957/orgs","repos_url":"https://api.github.com/users/sigma957/repos","events_url":"https://api.github.com/users/sigma957/events{/privacy}","received_events_url":"https://api.github.com/users/sigma957/received_events","type":"User","site_admin":false},"created_at":"2015-01-25T16:23:02Z","updated_at":"2015-01-25T16:23:02Z","body":"I'm asking because when I tried it out of curiosity (16x16 grid) the\r\nextruder began to move up and down in a fashion that led me to believe that\r\nit is using only grid points and not interpolating between them. Haven't\r\nlooked at the code since I'm not interested in z-correction, but that was\r\nthe impression. Thanks for clarifying.\r\n\r\nBtw, I managed to calibrate the printer finely but only when I modified by\r\nhand the endstop offset. For some reason G132 did not center the extruder\r\nexactly. The nonlinear behaviour disappeared only after my manual fine\r\ntuning. Thanks for all the advices, now I can print PLA on a cold bed.\r\n\r\nOn Sat, Jan 24, 2015 at 1:34 PM, repetier <notifications@github.com> wrote:\r\n\r\n> Babystepping is completely independent from anything else, so no.\r\n>\r\n> —\r\n> Reply to this email directly or view it on GitHub\r\n> <https://github.com/repetier/Repetier-Firmware/issues/353#issuecomment-71312502>\r\n> .\r\n>"}}