Jim's Flying Motor Mount Dual Extruder
by doctek, published
Jim's Flying Motor Mount Dual Extruder is a compact, light-weight, dual extruder which can be used on Mendel, Prusa, Wallace, and Printrbot 3D printers (and others) which currently use the single Greg's Wade's Extruder. This new design offers a true dual extrusion capability to these printers, allowing two color printing, or use of an alternate support material.
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Print two each of jimsFMM45DualOK.stl, jimsFMM45DualLgGearOK.stl, and jimsFMM45DualSMGearOK.stl. The file jimsFMM45DualOK.stl contains the Extruder Body and the Tensioner. The “OK” means that the stls have been run through Netfabb and should slice cleanly. I used Slic3r and had no problems. After printing, you'll need to cut away the support material on the body. The file “gears with axis.stl” is for visualization of gear alignment in the scad file and is not meant to be printed.
The files jimsFMM45Dual.scad and jimsFMM45DualGears.scad are the design files. Commenting in the files will explain how to visualize the construction and print the pieces.
The files configuration.scad, metric.scad, and functions.scad are direct copies of the Josef Prusa files of the same names and are provided for convenience.
The file parametric_involute_gear_v5jkl.scad is a slightly modified version of Greg Frost's excellent parametric gear file. I want to fully acknowledge the great work of Greg Frost in creating this file. The gear designs in it made my extruder design possible. Many thanks, Greg! The few changes I've made are in the comments in the file. Place this file in a file folder named “inc”. Note that one of the changes I made causes the gears to render correctly even using “F5” in OpenSCAD. Be warned that this rendering takes minutes, not seconds!
Instructions for building Jim's Flying Motor Mount Dual Extruder are in an Instructable that I am releasing at the same time as I release this Thing. I'll edit this to add the link. Please refer to the Instructable for complete, step-by-step instructions, with lots of pictures. http://www.instructables.com/id/Build-a-Dual-Extruder-for-3D-Printing/