Parametric Herringbone Gear Set for Huxley extruder #30DoC

by RichRap, published

Parametric Herringbone Gear Set for Huxley extruder #30DoC by RichRap Jun 2, 2012
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This is a set of herringbone gears using the SCAD Script from Triffid Hunter, but with settings for smaller Huxley (eMaker / RepRap Pro) extruders that use M6 hobbed bolts and a Nema14 motor

Enjoy perfect printing with Huxley.

Made for Day 2 of 30 days of Creativity #30DoC - http://30daysofcreativity.com/

More on my blog - www.richrap.blogspot.com


They are a little tricky to fit onto the extruder body, take your time and get the motor aligned first, fix the motor tightly, then tighten the hobbed bolt onto the large gear, fit washers and bearing and slide both the large motor into the body and at the same time the smaller gear onto the motor shaft, tighten up the smaller gear to the motor shaft.

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Well, I made some. They look great!

But I mis measured the nut size for the small gear and need to re-print. The big gear is perfect. Since I'm new to OpenSCAD, could someone tell me which lines to comment out? When I tried it I got a messed up small gear or errors. Or perhaps refer me to an existing file that's been created to separate them?

Thank you!

Edit: instead of that, I edited in the features I needed, created a new .stl, then used 3D Blender (Windows 10 built in feature- hey!) and used Edit > Slice. FANTASTICALLY easy. A+ Windows.

I added this comment so anyone reading can use this feature themselves on anything.

Hi ! Just for me to know : if I want to use 43:10 gears ratio, I just have to change the teeth numbers of these gears in openscad right ? Nothing else ?

Wow. Such print. Very infill. Much gears. Seriously, I can hardly hear my extruder now. Thank you!

Digging up an old post for my old machine!
Hi Rich, I've been using these gears for around 4 months now, they're gold! (Physically they're ABS, but they're worth their weight in gold!)

I'm looking at the SCAD script now as I'm starting to use SCAD and thought I'd edit the 'spoke pattern' - I've noticed the note:

"It's helpful to choose prime numbers for the gear teeth."

Why is this? Just for even wear purposes? or is there a mechanical advantage to prime numbers?

Also, if I were to simply change the "number" of teeth - does this script adapt the new pressure angles etc? If I doubled the teeth (and increased the spacing between the shafts) for example, would it produce an unusable profile or it's "all worked out" within the script?

Excuse the n00b-ish questions - you seem to have a lot of experience in this area :-)

Great ! glad you like them.

The comment about prime numbers was added to the Scad script before I modified it for the Huxley, I have made many different sized gears based on this spec, and I always try to make gear ratio's that have a sensible gearing (whole numbers) for the motor steps per mm.

Yes you can change numbers of teeth on both gears and also the distance between gears (very handy), it works out the rest for you. Some settings will produce junk, so experiment!

Have fun.

Hi Richard,

I'm just about to print a set of these on the quest for 'the perfect huxley print'...
...do you need to change the E steps setting in firmware after changing to these gears from the original RepRapPro Huxley ones? The have different ratio and I'm wondering if this affects the number of steps neede

Hi Andrew,

Yes the Esteps will need to be calibrated for this change, should not be too different. Let me know how you get on, My Huxley is having a refit at the moment and is out of action. I'm just about to be using this gear set on a miniature direct drive extruder, done for Day 4 of #30DoC.



I don't own a huxley, but you should have to change the steps if the gear ratio isn't the same. You should be able to do this by doing


and get either the exact new spot or very very close to it. Depending on if it's going up or down you may also want to check the current settings on your stepper, you might be able to lower them to get better lifetime out of the stepper or have to turn them up since you might need more torque.