See the repo here:
https://github.com/Jesssullivan/maggen/tree/master/coilbot_ArduinoRampsDriver
Parent here:
https://github.com/subatomicglue/maggen
Added Sketchup Viewer 10/17/19- see below

Parent machine:
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...Adding a parametric (wire gauge, coil bobbin width, stepper resolution) guide:



...More to come soon xD