Micro DUAL/QUAD Extruder

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##Number 3 Of 5 For [Gyrobot'S Extruder Week](Http://3Dprintboard.Com/Showthread.Php?3038-Single-Dual-And-Quad-Extruder-Week). This Is A Dual Extruder With A Small Footprint (105Mm X 42Mm X 42Mm). Two Can Be Placed Back To Back To Create A Quad (105Mm X 84Mm X 42Mm). I Got A Friend To Measure The Size Of A Replicator 2 Single Extruder (Not Dual) Which Is 71Mm X 84Mm X 76Mm So It Seems Even The Quad Has A Smaller Volume. The Fact That It Is Small, Increases The Possibilities To Print With Dual Hotends Where Space Or Weight May Be A Factor. The Pitch Between The Hotends Is Only 20Mm For Dual And Quad. I Know Bowden Extruders Are One Option Where Space Is Limited But I Designed This With The Requirement To Print With Ffx Elastic Filaments From [Recreus](Http://Www.Recreus.Com/), Something That Bowden Extruders Can Have Issues With. - It Can Be Mounted Onto Multiple Types Of Carriages Either In X Or Y Orientations. - Cooling Of The Hotends Is Provided From A Single 40X 40 X 10 Fan. Ducting Built In Through The Extruder Splits Off Some Of The Airflow And Cools The Nema 17 Motors, Mk7 Drive And The Plastic Body. - Two Of These Duals Can Be Placed Back To Back To Make A Quad Extruder For Experimentalists Pushing New Frontiers. However, As Far As I Know, There Is No Turn-Key Solution For Quad Electronics Yet, So This Has Not Been Tested. I Don'T Know If It Will Keep Cool Sufficiently But Feel Free To Make/Test And Report Your Findings. - Full Filament Support After The Mk7 Gear Wheel Allows A Ptfe Tube Insert To Be Added Down Into The Hotend For Flexible Filament Printing. If You Want To Know How To Print With This Type Of Filament, Please Read The Following [Article](Http://Www.Recreus.Com/Content/8-How-To-Print-With-Filaflex-). - It Is Printable Without Support, However A Small Amount Of Support Is Modelled In To Be Easily Snipped Off Afterwards. Video Of Filaflex Printing At 90Mm/S : Http://Youtu.Be/Qn4Zmwwcur8 Here Is A Video Of My First Dual Extrusion Print : Http://Youtu.Be/Hbaalzisln0

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