{"action":"created","issue":{"url":"https://api.github.com/repos/alexrj/Slic3r/issues/3045","labels_url":"https://api.github.com/repos/alexrj/Slic3r/issues/3045/labels{/name}","comments_url":"https://api.github.com/repos/alexrj/Slic3r/issues/3045/comments","events_url":"https://api.github.com/repos/alexrj/Slic3r/issues/3045/events","html_url":"https://github.com/alexrj/Slic3r/issues/3045","id":101804007,"number":3045,"title":"[1.2.9-dev] Slic3r autospeed causing negative F values to be output in gcode","user":{"login":"lordofhyphens","id":31754,"avatar_url":"https://avatars.githubusercontent.com/u/31754?v=3","gravatar_id":"","url":"https://api.github.com/users/lordofhyphens","html_url":"https://github.com/lordofhyphens","followers_url":"https://api.github.com/users/lordofhyphens/followers","following_url":"https://api.github.com/users/lordofhyphens/following{/other_user}","gists_url":"https://api.github.com/users/lordofhyphens/gists{/gist_id}","starred_url":"https://api.github.com/users/lordofhyphens/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/lordofhyphens/subscriptions","organizations_url":"https://api.github.com/users/lordofhyphens/orgs","repos_url":"https://api.github.com/users/lordofhyphens/repos","events_url":"https://api.github.com/users/lordofhyphens/events{/privacy}","received_events_url":"https://api.github.com/users/lordofhyphens/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":1,"created_at":"2015-08-19T04:19:57Z","updated_at":"2015-12-16T02:00:27Z","closed_at":null,"body":"On the provided STL, setting autospeed causes negative speed values to be used in output gcode.\r\n\r\nI can confirm it doesn't have this behavior on the 5mm calibration step cube on youmagine/thingiverse\r\n\r\nTest stl and config:\r\nhttp://www.2shared.com/file/ckhcBgcM/negative-accel.html"},"comment":{"url":"https://api.github.com/repos/alexrj/Slic3r/issues/comments/164962624","html_url":"https://github.com/alexrj/Slic3r/issues/3045#issuecomment-164962624","issue_url":"https://api.github.com/repos/alexrj/Slic3r/issues/3045","id":164962624,"user":{"login":"W3DRK","id":16314246,"avatar_url":"https://avatars.githubusercontent.com/u/16314246?v=3","gravatar_id":"","url":"https://api.github.com/users/W3DRK","html_url":"https://github.com/W3DRK","followers_url":"https://api.github.com/users/W3DRK/followers","following_url":"https://api.github.com/users/W3DRK/following{/other_user}","gists_url":"https://api.github.com/users/W3DRK/gists{/gist_id}","starred_url":"https://api.github.com/users/W3DRK/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/W3DRK/subscriptions","organizations_url":"https://api.github.com/users/W3DRK/orgs","repos_url":"https://api.github.com/users/W3DRK/repos","events_url":"https://api.github.com/users/W3DRK/events{/privacy}","received_events_url":"https://api.github.com/users/W3DRK/received_events","type":"User","site_admin":false},"created_at":"2015-12-16T02:00:27Z","updated_at":"2015-12-16T02:00:27Z","body":"I have also witnessed this using Slic3r built from the current source.  It has occurred on every STL I've tried slicing so far, and causes my print controller to freeze.\r\n\r\nHere's an example snippet of offending GCode:\r\n\r\nG1 Z0.450 F7800.000\r\nG1 X129.694 Y121.278 F7800.000\r\nG1 Z0.250 F7800.000\r\nG1 E4.00000 F6000.00000\r\nG1 F-360.595\r\nG1 X106.300 Y121.278 E5.15010\r\nG1 X106.296 Y120.642 E5.18137\r\nG1 X109.185 Y120.639 E5.32340\r\nG1 X109.730 Y120.572 E5.35041\r\n"}}