{"action":"created","issue":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2585","labels_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2585/labels{/name}","comments_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2585/comments","events_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2585/events","html_url":"https://github.com/MarlinFirmware/Marlin/issues/2585","id":98887173,"number":2585,"title":"4 Extruders","user":{"login":"mistsoul","id":13499970,"avatar_url":"https://avatars.githubusercontent.com/u/13499970?v=3","gravatar_id":"","url":"https://api.github.com/users/mistsoul","html_url":"https://github.com/mistsoul","followers_url":"https://api.github.com/users/mistsoul/followers","following_url":"https://api.github.com/users/mistsoul/following{/other_user}","gists_url":"https://api.github.com/users/mistsoul/gists{/gist_id}","starred_url":"https://api.github.com/users/mistsoul/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mistsoul/subscriptions","organizations_url":"https://api.github.com/users/mistsoul/orgs","repos_url":"https://api.github.com/users/mistsoul/repos","events_url":"https://api.github.com/users/mistsoul/events{/privacy}","received_events_url":"https://api.github.com/users/mistsoul/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/labels/Support%20Question","name":"Support Question","color":"cc317c"}],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":9,"created_at":"2015-08-04T04:37:17Z","updated_at":"2015-08-09T14:54:29Z","closed_at":null,"body":"Hello all,\r\n\r\nI have some questions as I am upgrading my machine.\r\n\r\nMy machine has a RAMP 1.4 board, i don't think I can run 4 extruders with it, or are there any tricks to easily upgrade it to do so?\r\n\r\nIf not, I was thinking about getting an Azteeg X3 Pro fully loaded so once I get there i may need some help to configure it and ensure that the amps are correct on each motors, if there are tricks to do so not knowing the current capacity of my current motors, please let me know. \r\n\r\nAlso are there any parts of my Ramp board that I can use with the Azteeg board, which would allow me to not necessarily get it fully loaded, like the stepper drivers?\r\n\r\nThe duet + duex can do 4 extruders also but i don't think it is sold in the US?\r\n\r\nAt this point I am working on re-configuring Marlin and I am having some challenges with setting the extruders. I asked the manufacturer what motors he was using but he did not share the information. \r\n\r\nDo you guys have any trick to figure out exactly what motors are used in the machine? From the dimensions (42x42x40mm) I can guess that the ones used are Nema 17 and not more than 45 N-cm, but no idea on the current and ohms, also other axis motors seem to be the same as the extruders. I thought it would be good to know the exact model if possible in case I want to buy the same exact motors so I can leave the steps per mm the same in the firmware.\r\n\r\nThe machine is dual extruder and if I can’t get the same extruder motors, I will need to get two more motors for the 2 additional extruders that I am planning. Those would not be mounted on the head so I was looking at maybe 59 N-cm but not sure if the additional torque is not needed. \r\n\r\nAlso for the new extruders would it make a whole lot of difference if I get them at .9 degrees instead of 1.8, i would think it would for the axis but not sure if it is that useful for the extruders. \r\n\r\nNow if I get different motors than the ones i currently have (E0=E1 existing and E2=E3 new), what do I do with the steps per mm, since it seems like i cannot not set a different steps/mm? I would like to set them as #define DEFAULT_AXIS_STEPS_PER_UNIT {X,Y,Z,E0, E1, E2, E3} but I was told that Marlin won't know what to do with it? Has anyone set different steps/mm for their multi extruders using different motors? if not, how do you cope with having the same steps/mm for all extruder motors.\r\n\r\nSorry I have a lot of questions, thanks for your help!"},"comment":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/comments/129193896","html_url":"https://github.com/MarlinFirmware/Marlin/issues/2585#issuecomment-129193896","issue_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2585","id":129193896,"user":{"login":"mistsoul","id":13499970,"avatar_url":"https://avatars.githubusercontent.com/u/13499970?v=3","gravatar_id":"","url":"https://api.github.com/users/mistsoul","html_url":"https://github.com/mistsoul","followers_url":"https://api.github.com/users/mistsoul/followers","following_url":"https://api.github.com/users/mistsoul/following{/other_user}","gists_url":"https://api.github.com/users/mistsoul/gists{/gist_id}","starred_url":"https://api.github.com/users/mistsoul/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mistsoul/subscriptions","organizations_url":"https://api.github.com/users/mistsoul/orgs","repos_url":"https://api.github.com/users/mistsoul/repos","events_url":"https://api.github.com/users/mistsoul/events{/privacy}","received_events_url":"https://api.github.com/users/mistsoul/received_events","type":"User","site_admin":false},"created_at":"2015-08-09T14:54:29Z","updated_at":"2015-08-09T14:54:29Z","body":"@anhardt when this is programmed into Marlin, for example for a single motor double extruder, how does the slicing engine when generating gcode know to use only E0 for color changes after servo switch (M280). I think this was asked in another area of the forum but there were no answers. "}}