It is! https://github.com/Creality3DPrinting/Ender-3 https://github.com/Creality3DPrinting/Ender-3 It uses http://marlinfw.org/ http://marlinfw.org/ with only

It is! https://github.com/Creality3DPrinting/Ender-3 https://github.com/Creality3DPrinting/Ender-3 It uses http://marlinfw.org/ http://marlinfw.org/ with only modifications to the configuration (which, you need to do for any printer using Marlin). But the above link also includes the PCB design, mechanical design, and more. The whole 3D printing community is a lot like this. See http://vorondesign.com/ http://vorondesign.com/, an open set of design you can build yourself from off the shelf parts and a quality 3D printer.