Download and import into Simplify3D for use with the BCN3D Sigma 3D Printer Do comment on how they work for you, and if you make more or add a material - feature or anything else, please share them back here - this entry can be edited by any user so feel free to add or update details as needed.For reference the dual extrusion models used in the images here are from Nervous system (Dual frog) - https://www.youmagine.com/nervous-system/designsAnd Mark Durbin (MakeAlot) for the awesome dual extruder pen pots - https://www.youmagine.com/makealot/designs