Itty Bitty Double FLEX V2 Extruder (With mount for MakerFarm Printers)

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This is the third evolution of the Itty Bitty Double Extruder. NOTICE: Version 2.1 released, See notes below. A hardware kit is available; links below. New in this version: Better flexible filament control. Supports Hexagon AO. Designed for easier printability with less cleanup. Low-profile shelf brackets to support underslung X endstops. Support for more Z probe switch types. Key Features: Designed for Hexagon or E3Dv6 hot ends on 27mm centers. Short, straight filament path to accommodate flexible materials. Uses the same hardware kit as all Itty Bitty Double Extruders. NEMA 14 motors. Silent GT2 belt drives with printed pulleys. Integrated servo Z probe. Cam-lock idler bearing pins. Uses our custom hobbed bolts (or equivalent). Lighter than a stock single Accessible Extruder. Integrated hot end cooling. Mounting hardware for Prusa i3v printers. Printable Files: All of the files are included for the entire extruder system for 1.75mm and 3mm filament, Hexagon and E3Dv6 hot ends. To assemble the entire system you will need to print: One extruder block. For 3mm hot ends: Double Flex Block-300Universal.STL. For 1.75mm hot ends without a liner: Double Flex Block-175Universal.STL. For 1.75mm E3D hot ends with a PTFE liner and fitting: Double Flex Block-175E3dLiner.STL. Hot end-specific parts: Hexagon hot ends: All of the parts with "hexagon" in the file name. An alternate fan shroud is provided for the Hexagon AO. E3D hot ends: All of the parts with "e3dv6" in the file name. Common parts: You will need two copies each of the idler blocks, idler pins, pulleys and round spacers and one copy of everything else. Optional parts: I3VXCarriagePlate.STL - replacement for standard i3v X carriage plate Adjustable I3VXCarriagePlate.STL - X carriage plate with a larger hole to use an extra V-slot eccentric in one of the upper holes for leveling Print Settings: Printer: MakerFarm Prusa i3v. Rafts: No. Supports: No. Resolution: .2mm. Infill: 40%. Notes: I recommend ABS. Some people have reported great success with PETG. Post-Printing Required Hardware In addition to the printed parts, you will need the following vitamins: Hardware kit. Available here. GT2 20-tooth Pulleys with set screws (2). GT2 200mm Belts (2). 688ZZ 8x16x5mm Bearings (6). Extension springs (2). Fiberglass/Polyimide insulator. M2.5×10 socket head cap screws (2). M4x.7 hex nuts (2). M4x20 button head cap screws (2). M3 flat washers (6). M3x.5 hex nuts (11). M3x25 socket head cap screws (3). M3x16 button head socket cap screws (10). M3x12 flat head socket cap screws (10). M3x8 socket head cap screws (6). M3x6 button head socket cap screws (2). Light springs for flexible filament (optional). Available here. Hobbed bolts with jam nuts (2). Available here. Hot Ends (matched pair) Hexagon E3Dv6 NEMA 14 stepper motors (2). Available here. HXT-900 Servo. Available here. Z probe switch. You can use virtually any snap switch, including the one that came with your MakerFarm printer. 25x25x10mm fan (Hexagon hot ends only) The 25mm fan included with most Hexagon hot end kits will work fine Recommended upgrade: http://www.digikey.com/product-search/en?KeyWords=259-1570-ND 40x40x10mm fan (for print cooling). A 40mm fan is now included with most Hexagon hot ends. Assembly Instructions: Detailed assembly instructions can be found here: Itty Bitty Double FLEX Assembly Instructions Firmware setup: Marlin Firmware Setup Calibration: Double Extruder Calibration Release Notes for Version 2.1 Version 2.1 includes the following changes: Added longer versions of the Z probe arms for switches without levers Fixed thickness of Hexagon double groove mount for a better fit