Jim's Flying Motor Mount Dual Extruder
by doctek, published
Recent Commentsview all
I don't recall exactly. One quick way to get a pretty accurate measurement is to use the measurement tool in MeshLab. Then experiment with the SCAD files to find the value that moves the screws. This was one of my first major SCAD designs and isn't as well parameterized as it could be.
I don't know the torque spec. Usually, I get an idea of the torque by measuring the resistance of one coil. My best NEMA 17s measure about 1 Ohm. My NEMA 14s which I am using measure about 3 Ohms. I have some other NEMA 14s that measure 6 Ohms and don't work in this application. Note the need for cooling fans to dissipate the heat when the motors are running. Turning the current down so heat is not a problem results in the motors not putting out enough torque.
Instead of an adaptor plate for a vertical X carriage, how about punching 2 m3 holes through on 50mm or 80mm centers. I am trying to figure out how to do that - I think you would end up with one bolt through each extruder, and it could run into problems with levelling. It's a bit hard to pick off the distances from the scad file: how far apart do the outside holes for the two hot-end mounting screws end up?
Liked Byview all
Give a Shout Out
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 â€œincâ€. Note that one of the changes I made causes the gears to render correctly even using â€œF5â€ 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.
You must be logged in to post a comment.