{"action":"created","issue":{"url":"https://api.github.com/repos/MatterHackers/MatterControl/issues/52","labels_url":"https://api.github.com/repos/MatterHackers/MatterControl/issues/52/labels{/name}","comments_url":"https://api.github.com/repos/MatterHackers/MatterControl/issues/52/comments","events_url":"https://api.github.com/repos/MatterHackers/MatterControl/issues/52/events","html_url":"https://github.com/MatterHackers/MatterControl/issues/52","id":45298075,"number":52,"title":"Matterslice extrusion width","user":{"login":"whosawhatsis","id":319404,"avatar_url":"https://avatars.githubusercontent.com/u/319404?v=3","gravatar_id":"","url":"https://api.github.com/users/whosawhatsis","html_url":"https://github.com/whosawhatsis","followers_url":"https://api.github.com/users/whosawhatsis/followers","following_url":"https://api.github.com/users/whosawhatsis/following{/other_user}","gists_url":"https://api.github.com/users/whosawhatsis/gists{/gist_id}","starred_url":"https://api.github.com/users/whosawhatsis/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/whosawhatsis/subscriptions","organizations_url":"https://api.github.com/users/whosawhatsis/orgs","repos_url":"https://api.github.com/users/whosawhatsis/repos","events_url":"https://api.github.com/users/whosawhatsis/events{/privacy}","received_events_url":"https://api.github.com/users/whosawhatsis/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":{"login":"larsbrubaker","id":1158332,"avatar_url":"https://avatars.githubusercontent.com/u/1158332?v=3","gravatar_id":"","url":"https://api.github.com/users/larsbrubaker","html_url":"https://github.com/larsbrubaker","followers_url":"https://api.github.com/users/larsbrubaker/followers","following_url":"https://api.github.com/users/larsbrubaker/following{/other_user}","gists_url":"https://api.github.com/users/larsbrubaker/gists{/gist_id}","starred_url":"https://api.github.com/users/larsbrubaker/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/larsbrubaker/subscriptions","organizations_url":"https://api.github.com/users/larsbrubaker/orgs","repos_url":"https://api.github.com/users/larsbrubaker/repos","events_url":"https://api.github.com/users/larsbrubaker/events{/privacy}","received_events_url":"https://api.github.com/users/larsbrubaker/received_events","type":"User","site_admin":false},"milestone":null,"comments":5,"created_at":"2014-10-08T21:16:06Z","updated_at":"2015-04-20T22:17:13Z","closed_at":null,"body":"Matterslice doesn't seem to include any way of setting the extrusion width, it just uses the nozzle diameter. The theoretically ideal extrusion width is actually equal to the nozzle diameter PLUS the layer height. This will produce an extrusion with flat parts on the top and bottom that are the width of the nozzle, plus a semicircle on each side with a radius of half the layer height. Using an extrusion width smaller than this can result in an unpredictable extrusion profile, and it may cause poor inter-layer adhesion, bad overhang quality, etc. The obvious exception is bridging, where the plastic is not being compressed by a previous layer, in which case the extrusion width should ideally be adjusted to make the cross-sectional area match that of extrusion of the same plastic into air at the same speed and temperature (there are a lot of variables that go into die swell).\r\n\r\nIdeally, MatterControl should calculate this theoretically ideal extrusion width by adding the nozzle diameter and layer height settings, and provide that value to the slicer as extrusion width."},"comment":{"url":"https://api.github.com/repos/MatterHackers/MatterControl/issues/comments/94582057","html_url":"https://github.com/MatterHackers/MatterControl/issues/52#issuecomment-94582057","issue_url":"https://api.github.com/repos/MatterHackers/MatterControl/issues/52","id":94582057,"user":{"login":"whosawhatsis","id":319404,"avatar_url":"https://avatars.githubusercontent.com/u/319404?v=3","gravatar_id":"","url":"https://api.github.com/users/whosawhatsis","html_url":"https://github.com/whosawhatsis","followers_url":"https://api.github.com/users/whosawhatsis/followers","following_url":"https://api.github.com/users/whosawhatsis/following{/other_user}","gists_url":"https://api.github.com/users/whosawhatsis/gists{/gist_id}","starred_url":"https://api.github.com/users/whosawhatsis/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/whosawhatsis/subscriptions","organizations_url":"https://api.github.com/users/whosawhatsis/orgs","repos_url":"https://api.github.com/users/whosawhatsis/repos","events_url":"https://api.github.com/users/whosawhatsis/events{/privacy}","received_events_url":"https://api.github.com/users/whosawhatsis/received_events","type":"User","site_admin":false},"created_at":"2015-04-20T22:17:13Z","updated_at":"2015-04-20T22:17:13Z","body":"@soychicka Just lie about your nozzle diameter.\r\n\r\n@larsbrubaker The idea is that the optimum extrusion width may not be (I'm convinced that it is not) the nozzle diameter. Ryan Carlyle (who is in the other camp) and I have been discussing this in depth and doing some tests here: https://groups.google.com/forum/#!topic/3dp-ideas/2FG_gUxa_fE"}}