by schlem, published
Reworked from Brook Drumm's Printrbot's involute herringbone gears, (which were ultimately derived from works by Wade and Frost) thingiverse.com/thing:16990 and Cleaned Skull by ssd (http://www.thingiverse.com/thing:4126 .
Watch one come to life:
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The actual difference at the head is trivial. A little trimming and it can be made to fit easily. If it really is just too tight, I can make the M8 version later this week.
Thanks, I really appreciate it. I guess i didn't know that it was in an empirical measurement. I only use metric for all my stuff, as things like unit conversions and gear ratios are easier to figure out. Idk why everybody doesn't use it.
Im not sure wether the bolt in my extruder is metric or empirical, but i guess I can print it out and give it a shot. I would have done it sooner, but I've had some projects that I've been working on.
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I ditched the small skull on the small gear. It never printed well with the hole through the forehead and the reduction in size. The NEW! small gear has some nice features, including cleaned up teeth, and a strengthened area for the set screw. The small gear designed by jameswood is as his original.
Thanks to Emmett, I have a better understanding of involute gear geometry, and I should mention that these two gears are designed to work together. If you use a different drive gear (on the stepper) you may have issues with smooth meshing because of different variables in the tooth profile. They were both ultimately derived from Greg Frost's 9/43t herringbone extruder gear drive.
If you change gears on your extruder, you will need to change your mm/rotation calibration in firmware / slicing software.
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