by schlem, published

Skulltruder by schlem Feb 11, 2013


Behold and fear my Skulltruder! This is a set of spur gears for the Printrbot or any printer using Wade's accessible extruder. 13:43.
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.

Done, designed for a 5/16 hobbed bolt. Lemme know if you need an 8M version.

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UPDATE: There are now THREE versions of the Skulltruder - a 5/16 inch and and an 8mm to fit your favorite hobbed bolt, in addition to a straight spur designed (tooth profile poached from thing #41808 by jameswood).

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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GDH5 on Dec 23, 2013 said:

any chance someone could remix this with straight teeth? im not a fan of herringbone gears...

schlem on Jan 10, 2014 said:

Done, designed for a 5/16 hobbed bolt. Lemme know if you need an 8M version.

schlem on Dec 23, 2013 said:

I think that could be done. Busy week. stay tuned.

thecrazy on Sep 22, 2013 said:

Ohhh nice :D

schlem on Apr 5, 2013 said:

Tomvdb - This should work fine on any extruder design based on (or probably similar to) Wade's. You may need to shim the large cog out from the extruder body for best results, or, worst case scenario, make your own 5/16 hobbed bolt. If your extruder uses a different bolt (?) you could rework the hex inset in the middle. Cheers!

tomvdb on Apr 5, 2013 said:

So will this work on the regular Wade extruder?

amanica on Jul 2, 2013 said:

Did this work for you?

wizardtakax on Feb 18, 2013 said:

love it, did you try a herring bone gear in addition to spur design?

schlem on Feb 18, 2013 said:

You asked about trying the herringbone vs the spur gear... Not sure what you mean. This is just a rehash of the Printrbot herringbone gear, which is a rehash of Wade's, I believe. I have a laser-sintered version on order with Shapeways, but I wanna try printing it just to see how it comes out.