This design is created to update the K8200 printer to be able to use the E3D Kraken with the Airtripper's Bowden extruders. I've made a support that can be attached to the printer frame and on that support, you can mount two Airtripper's Bowden extruders. You can expand it by a second support so you can mount two extra extruders. There's also an adapter to mount the E3D Kraken to the printer frame. E3D Kraken: http://www.e3d-online.com/The-Kraken Aitripper's Bowden Extruder v3: http://www.thingiverse.com/thing:35404 You can find the .stl files and the files for Google SketchUp 7.