As I mention in the Infill 3D Bowden geared extruder, I like direct drives I will go as far and say that aesthetically direct drives are ahead; less parts, smaller, less complicated but at the price of reliability. Once more I wanted a compact extruder that has the reliability of a Wade's extruder here is what I came up with.
I made this extruder to work with the SunBurn hotend and the Infill 3D i3R however it will work with any hotend that has a 16mm groove mount, I wanted the extruder to be small and give me back some Z axis printing volume; from the bottom of the X-Carriage to the tip of the SunBurn hotend (this measurement will be different with other hotends) there is only 10mm+/- I could have gone lower but I wanted to play it safe.
Also it uses the same small 2/3 herringbone gears as my Bowden extruder making it very compact, check the pictures one of them has a quarter dollar coin for refrerence, I have been using it for the past few months and is been performing well.
Latest version and X-Carriage is at http://infill3d.com/20-downloads along with other parts that might interest Prusa i3 users.
If you find any errors or have any ideas for improvement let me know.
I have a couple of X-carriages for the i3 that were made for this extruder, they have a corner notch to allow for a standard gear size extruder in the event that you wish to change extruders check the download are of my site.
Some parts are small hence I highly recommend to print as many as possible in one go so there no issues with heat,
You are going to need...
3x 688ZZ Bearings (Extruder, Idler)
10x M3 Nuts (Extruder, idler, clamp, carrier)
2x M3 Washers (Springs)
2x M3X45 Socket screw (Extruder to idler)
4x M3X8 Socket screw (Motor)
2x M3X16 Socket screw (Idler)
2x M3X18 Socket screw (Clamp)
4x M3X25 Socket screw (Carrier)
2x 1/4" x 1/2" x .035" (6.350 x 12.7 x .889mm) Utility comp springs (Extruder to idler)
4x M8 Washers (Hobbed bolt)
2x M8 Nuts (Hobbed Bolt)
1x Hobbed bolt (distances between the center of the groove and the base of the head should be 25mm +/-)