{"action":"created","issue":{"url":"https://api.github.com/repos/prusa3d/Prusa-Firmware/issues/602","repository_url":"https://api.github.com/repos/prusa3d/Prusa-Firmware","labels_url":"https://api.github.com/repos/prusa3d/Prusa-Firmware/issues/602/labels{/name}","comments_url":"https://api.github.com/repos/prusa3d/Prusa-Firmware/issues/602/comments","events_url":"https://api.github.com/repos/prusa3d/Prusa-Firmware/issues/602/events","html_url":"https://github.com/prusa3d/Prusa-Firmware/issues/602","id":311711203,"number":602,"title":"Inconsistent Extrusion","user":{"login":"ff8jake","id":8582658,"avatar_url":"https://avatars3.githubusercontent.com/u/8582658?v=4","gravatar_id":"","url":"https://api.github.com/users/ff8jake","html_url":"https://github.com/ff8jake","followers_url":"https://api.github.com/users/ff8jake/followers","following_url":"https://api.github.com/users/ff8jake/following{/other_user}","gists_url":"https://api.github.com/users/ff8jake/gists{/gist_id}","starred_url":"https://api.github.com/users/ff8jake/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ff8jake/subscriptions","organizations_url":"https://api.github.com/users/ff8jake/orgs","repos_url":"https://api.github.com/users/ff8jake/repos","events_url":"https://api.github.com/users/ff8jake/events{/privacy}","received_events_url":"https://api.github.com/users/ff8jake/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":239,"created_at":"2018-04-05T17:59:31Z","updated_at":"2018-04-20T15:57:10Z","closed_at":null,"author_association":"NONE","body":"@XPila - Sorry for calling you out on this, just figured since you seem to be the one working on the linearity corrections and such you'd be the best in the know on this one.\r\n\r\nWe're seeing really inconsistent extrusion, beyond the moire effect that we were trying to fix with linearity correction. Do you know if they are related? I have tested a 40mm single wall cube with no infill, then cut it with scissors. Within a single wall on a single later, I have found my extrusion width getting wider/narrower (and only one extrusion command in the gcode for the entire wall). I also confirmed that where it becomes fatter happens on both the outside and the inside of the print, so this doesn't seem to be X/Y related.\r\n\r\nMany people on the forums are also seeing the same thing, here's some of the images. Looking at it straight on, the prints look fine and Z height seems to be fine. When you shine light down from above, the fatter lines cast shadows and it looks pretty rough.\r\n\r\n![extrusion](https://user-images.githubusercontent.com/8582658/38383023-ffe31bb8-38d0-11e8-88f9-78798cd8b2e6.jpg)\r\n![439ac03b-cdb8-4bb9-ab2d-93fc22ee58ff](https://user-images.githubusercontent.com/8582658/38383027-02e4859a-38d1-11e8-8d35-ae98282a631e.jpeg)\r\n![7c0698a6-a967-4ff5-826e-c872171844f5](https://user-images.githubusercontent.com/8582658/38383031-04aab840-38d1-11e8-9fd0-ce7b2f4b7339.jpeg)\r\n![img_20180315_220019](https://user-images.githubusercontent.com/8582658/38383035-07ca1e58-38d1-11e8-86e4-aa365c50e951.jpg)\r\n![img_20180315_191206](https://user-images.githubusercontent.com/8582658/38383039-0954c5a2-38d1-11e8-94e0-37b6be14afba.jpg)\r\n![20mm_perimeter](https://user-images.githubusercontent.com/8582658/38383041-0b092096-38d1-11e8-9a2a-51d1eb66502d.jpg)\r\n"},"comment":{"url":"https://api.github.com/repos/prusa3d/Prusa-Firmware/issues/comments/383141483","html_url":"https://github.com/prusa3d/Prusa-Firmware/issues/602#issuecomment-383141483","issue_url":"https://api.github.com/repos/prusa3d/Prusa-Firmware/issues/602","id":383141483,"user":{"login":"devilhunter84","id":38408115,"avatar_url":"https://avatars3.githubusercontent.com/u/38408115?v=4","gravatar_id":"","url":"https://api.github.com/users/devilhunter84","html_url":"https://github.com/devilhunter84","followers_url":"https://api.github.com/users/devilhunter84/followers","following_url":"https://api.github.com/users/devilhunter84/following{/other_user}","gists_url":"https://api.github.com/users/devilhunter84/gists{/gist_id}","starred_url":"https://api.github.com/users/devilhunter84/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/devilhunter84/subscriptions","organizations_url":"https://api.github.com/users/devilhunter84/orgs","repos_url":"https://api.github.com/users/devilhunter84/repos","events_url":"https://api.github.com/users/devilhunter84/events{/privacy}","received_events_url":"https://api.github.com/users/devilhunter84/received_events","type":"User","site_admin":false},"created_at":"2018-04-20T15:57:10Z","updated_at":"2018-04-20T15:57:10Z","author_association":"NONE","body":"@ff8jake \r\nI messed around with this previously, it's the TMC2130 calculator (look at the microstep table)\r\nhttps://www.trinamic.com/fileadmin/assets/Products/ICs_Documents/TMC5130_TMC2130_TMC2100_Calculations.xlsx\r\n\r\nAlso the manual: (page 78)\r\nhttps://www.trinamic.com/fileadmin/assets/Products/ICs_Documents/TMC2130_datasheet.pdf\r\n"}}
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