{"action":"created","issue":{"url":"https://api.github.com/repos/Ultimaker/Cura/issues/4871","repository_url":"https://api.github.com/repos/Ultimaker/Cura","labels_url":"https://api.github.com/repos/Ultimaker/Cura/issues/4871/labels{/name}","comments_url":"https://api.github.com/repos/Ultimaker/Cura/issues/4871/comments","events_url":"https://api.github.com/repos/Ultimaker/Cura/issues/4871/events","html_url":"https://github.com/Ultimaker/Cura/issues/4871","id":383942135,"node_id":"MDU6SXNzdWUzODM5NDIxMzU=","number":4871,"title":"[3.6.0] Inefficient small gap filling between walls","user":{"login":"lekv","id":151514,"node_id":"MDQ6VXNlcjE1MTUxNA==","avatar_url":"https://avatars2.githubusercontent.com/u/151514?v=4","gravatar_id":"","url":"https://api.github.com/users/lekv","html_url":"https://github.com/lekv","followers_url":"https://api.github.com/users/lekv/followers","following_url":"https://api.github.com/users/lekv/following{/other_user}","gists_url":"https://api.github.com/users/lekv/gists{/gist_id}","starred_url":"https://api.github.com/users/lekv/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/lekv/subscriptions","organizations_url":"https://api.github.com/users/lekv/orgs","repos_url":"https://api.github.com/users/lekv/repos","events_url":"https://api.github.com/users/lekv/events{/privacy}","received_events_url":"https://api.github.com/users/lekv/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":24,"created_at":"2018-11-23T23:39:35Z","updated_at":"2018-12-11T22:45:44Z","closed_at":null,"author_association":"NONE","body":"<!--\r\nThe following template is useful for filing new issues. Processing an issue will go much faster when this is filled out, and issues which do not use this template WILL BE REMOVED.\r\n\r\nBefore filing, PLEASE check if the issue already exists (either open or closed) by using the search bar on the issues page. If it does, comment there. Even if it's closed, we can reopen it based on your comment.\r\n\r\nAlso, please note the application version in the title of the issue. For example: \"[3.2.1] Cannot connect to 3rd-party printer\". Please do not write things like \"Request:\" or \"[BUG]\" in the title; this is what labels are for.\r\n\r\nIt is also helpful to attach a project (.3mf or .curaproject) file and Cura log file so we can debug issues quicker.\r\nInformation about how to find the log file can be found at https://github.com/Ultimaker/Cura/wiki/Cura-Preferences-and-Settings-Locations. To upload a project, try changing the extension to e.g. .curaproject.3mf.zip so that github accepts uploading the file. Otherwise we recommend http://wetransfer.com, but other file hosts like Google Drive or Dropbox work well too.\r\n\r\nThank you for using Cura!\r\n-->\r\n\r\n**Application Version**\r\n3.6.0\r\n<!-- The version of the application this issue occurs with -->\r\n\r\n**Platform**\r\nMacOS Mojave\r\n<!-- Information about the operating system the issue occurs on -->\r\n\r\n**Printer**\r\nCreality CR-10 with defaults (the printer doesn't seem to matter, it happened with an Ender 3 Pro, too.\r\n<!-- Which printer was selected in Cura. Please attach project file as .curaproject.3mf.zip -->\r\n\r\n**Steps to Reproduce**\r\nSlice a part that has a 2mm thick solid wall using a 0.4mm nozzle and 0.4mm wall thickness. Set wall-count to 2.\r\n<!-- Add the steps needed that lead up to the issue -->\r\n\r\n**Actual Results**\r\nThe whole part is 5 walls thick. That leaves 0.4mm in the middle, which should be filled with a single extruded line. In 3.5.1 this works as expected, but in 3.6.0 the gap is filled with a diagonal pattern instead, which leads to longer print times (and potentially less strength in the resulting part).\r\n\r\nAdditionally, parts that are 1.2mm / 3 lines wide get the same infill instead of a proper wall. If I change the line width to 0.399mm, then those get a single inner wall line inside, but the inside of a 5 line wide wall will still stay the same. Reducing the line width to 0.39mm causes the inside of the 5 line wide wall to become empty / standard infill pattern, like it wasn't considered a \"gap\" to be filled anymore.\r\n\r\nTurning off \"Fill Gaps Between Walls\" leaves the whole space unfilled in either case.\r\n\r\n<!-- What happens after the above steps have been followed -->\r\n\r\n**Expected results**\r\nSee above, like in 3.5.1 the gap should be filled with a single extrusion.\r\n<!-- What should happen after the above steps have been followed -->\r\n\r\n**Additional Information**\r\n<!-- Extra information relevant to the issue, like screenshots -->\r\nThis is how it looks in 3.6.0. Note how the part on the left hand side and the left wall of the lower two have a diagonal filling.\r\n\r\n![cura 3 6 0](https://user-images.githubusercontent.com/151514/48961921-b2f88b80-ef2d-11e8-95f8-3297df6b1b81.png)\r\n\r\nThis is how it looks with the width set to 3.99mm. Both lower walls now have a single line inside, but the left wall still doesn't.\r\n![cura 3 6 0 reduced width](https://user-images.githubusercontent.com/151514/48961931-c277d480-ef2d-11e8-8705-95f9eeeacf79.png)\r\n\r\nThis is how it looks in 3.5.1 (3.4.1 too), which makes me believe that this is a regression.\r\n![cura 3 5 1](https://user-images.githubusercontent.com/151514/48961937-d6233b00-ef2d-11e8-9d39-cb4e8b85294a.png)\r\n\r\nEdit: Here is the STL file that I used, please let me know if you need the Fusion 360 model, too.\r\n\r\n[Element.stl.zip](https://github.com/Ultimaker/Cura/files/2611881/Element.stl.zip)\r\n"},"comment":{"url":"https://api.github.com/repos/Ultimaker/Cura/issues/comments/446391699","html_url":"https://github.com/Ultimaker/Cura/issues/4871#issuecomment-446391699","issue_url":"https://api.github.com/repos/Ultimaker/Cura/issues/4871","id":446391699,"node_id":"MDEyOklzc3VlQ29tbWVudDQ0NjM5MTY5OQ==","user":{"login":"smartavionics","id":585618,"node_id":"MDQ6VXNlcjU4NTYxOA==","avatar_url":"https://avatars1.githubusercontent.com/u/585618?v=4","gravatar_id":"","url":"https://api.github.com/users/smartavionics","html_url":"https://github.com/smartavionics","followers_url":"https://api.github.com/users/smartavionics/followers","following_url":"https://api.github.com/users/smartavionics/following{/other_user}","gists_url":"https://api.github.com/users/smartavionics/gists{/gist_id}","starred_url":"https://api.github.com/users/smartavionics/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/smartavionics/subscriptions","organizations_url":"https://api.github.com/users/smartavionics/orgs","repos_url":"https://api.github.com/users/smartavionics/repos","events_url":"https://api.github.com/users/smartavionics/events{/privacy}","received_events_url":"https://api.github.com/users/smartavionics/received_events","type":"User","site_admin":false},"created_at":"2018-12-11T22:45:44Z","updated_at":"2018-12-11T22:45:44Z","author_association":"CONTRIBUTOR","body":"The min infill area feature does appear to act weird - it is affected by the use of skin removal width. Your profile has a value of 0.8mm for that. If you reduce it to zero then that central region of skin on layer 51 doesn't look too bad with a min infill area value of 30 but does go wrong when the min infill area is increased to 50. To be honest, I can't really be bothered to find out what they have broken exactly, life's too short!"}}
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