{"action":"created","issue":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/853","labels_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/853/labels{/name}","comments_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/853/comments","events_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/853/events","html_url":"https://github.com/MarlinFirmware/Marlin/issues/853","id":30002383,"number":853,"title":"Odd single thickness wall bug","user":{"login":"mattsch","id":134440,"avatar_url":"https://avatars.githubusercontent.com/u/134440?v=3","gravatar_id":"","url":"https://api.github.com/users/mattsch","html_url":"https://github.com/mattsch","followers_url":"https://api.github.com/users/mattsch/followers","following_url":"https://api.github.com/users/mattsch/following{/other_user}","gists_url":"https://api.github.com/users/mattsch/gists{/gist_id}","starred_url":"https://api.github.com/users/mattsch/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mattsch/subscriptions","organizations_url":"https://api.github.com/users/mattsch/orgs","repos_url":"https://api.github.com/users/mattsch/repos","events_url":"https://api.github.com/users/mattsch/events{/privacy}","received_events_url":"https://api.github.com/users/mattsch/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/labels/Needs+update","name":"Needs update","color":"207de5"}],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":48,"created_at":"2014-03-24T00:15:56Z","updated_at":"2015-01-09T16:51:39Z","closed_at":"2014-04-13T20:15:58Z","body":"I had submitted this issue over to Slic3r first ([#1873](https://github.com/alexrj/Slic3r/issues/1837)),  moved here after their review.\r\n\r\nWhen trying to print the standard 20mm calibration cube to calculate extrusion multiplier with the extrusion width set to .40mm, I get a very interesting leaning tower (picture attached).  If I let Slic3r do it's own calculation, bump the width up manually to .48mm, or rotate the cube 45 degrees before slicing then it prints perfectly.\r\n\r\nI went through and checked all my mechanics, haven't had any other issues manifest that would indicate faulty parts.  I'm running the latest from the Marlin_v1 branch and my repo with configs is [here](https://github.com/mattsch/Marlin/tree/mendel90_lcd).\r\n\r\n![img_20140317_110330](https://f.cloud.github.com/assets/134440/2495123/95177e40-b2e8-11e3-83a1-c6db8da6e0d2.jpg)\r\n\r\nSTL, gcode, etc:\r\nhttp://www.excentral.org/files/slic3r_thing_wall_bug.tar.gz"},"comment":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/comments/69362140","html_url":"https://github.com/MarlinFirmware/Marlin/issues/853#issuecomment-69362140","issue_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/853","id":69362140,"user":{"login":"nicolas-rambaud","id":5071675,"avatar_url":"https://avatars.githubusercontent.com/u/5071675?v=3","gravatar_id":"","url":"https://api.github.com/users/nicolas-rambaud","html_url":"https://github.com/nicolas-rambaud","followers_url":"https://api.github.com/users/nicolas-rambaud/followers","following_url":"https://api.github.com/users/nicolas-rambaud/following{/other_user}","gists_url":"https://api.github.com/users/nicolas-rambaud/gists{/gist_id}","starred_url":"https://api.github.com/users/nicolas-rambaud/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nicolas-rambaud/subscriptions","organizations_url":"https://api.github.com/users/nicolas-rambaud/orgs","repos_url":"https://api.github.com/users/nicolas-rambaud/repos","events_url":"https://api.github.com/users/nicolas-rambaud/events{/privacy}","received_events_url":"https://api.github.com/users/nicolas-rambaud/received_events","type":"User","site_admin":false},"created_at":"2015-01-09T16:51:39Z","updated_at":"2015-01-09T16:51:39Z","body":"Hello i’ve written an article about how to choose a pulley\r\n\r\nhttps://nutz95.wordpress.com/2014/12/02/reprap-how-to-choose-your-pulleys-for-your-3d-printer/\r\n\r\nAnd a few pulleys size are not adequate depending on your stepper settings.\r\n\r\nIf you use 16, 20 or 25 teeth with GT2 belt 2mm pitch and 1.8°/step motor\r\nyou should have integer steps/mm values.\r\n\r\nIn other cases you will get some rounding errors.\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n*De :* Chris [mailto:notifications@github.com]\r\n*Envoyé :* vendredi 9 janvier 2015 17:38\r\n*À :* MarlinFirmware/Marlin\r\n*Objet :* Re: [Marlin] Odd single thickness wall bug (#853)\r\n\r\n\r\n\r\nOr if it chose to ignore such a short move it should leave its current\r\nposition unchanged, so the next move would simply go a bit further. There\r\nshould never be a cumulative error.\r\n\r\n—\r\nReply to this email directly or view it on GitHub\r\n<https://github.com/MarlinFirmware/Marlin/issues/853#issuecomment-69359915>.[image:\r\nImage supprimée par l'expéditeur.]"}}