More Brain Gears

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Published on July 20, 2012
This thing was Featured on July 20, 2012

Description

Yet another set of brain gears. The gear was made using the MCAD openscad module.

Instructions

Print 12 gears and 6 frames.
Cut 12 axles from 3 mm filament, each 23 mm long.
Assemble the frames into an octahedron, placing a gear on each axle.
It should all stay together with a press fit.
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Is there a version of this that uses 1.75mm filament for the shafts? There seem to be a lot of stuff on Thingiverse that use the 3mm filament for axles and other things but I don't have any to work with. I'm thinking of going to the hardware store and get a dowel or something that is 3mm so I can assemble some of these cool things.

Any 2.7 to 3.0 mm diameter plastic, wooden or metal rod should do for the axles. I'm not sure if 1.75 mm filament be strong enough for axles.

Hi elfnor. Thanks for posting the new thicker gear. My printer was not quite able to print the original without losing a few teeth. The thick gear printed fine. Like FalconFour I am using slic3r. Settings: no support, .4mm layers, 2 perimeters, 3 solid layers, 65mm/s, ABS. Printer: Printrbot LC. I will post a "Made One" photo when I finish.

Hate to say, but the gear is impossible to print with slic3r. At both 100% and 150% it begins drawing the center layers with only a dot of plastic on each post, then the remaining print falls apart under the weight and strain. It's a clever design but really needs more support across the center axis, or making the center of the posts a bit thicker. Can't wait to get it printed though... looks very cool!

I sliced it using Cura (layer thickness 0.2, wall thickness 0.8) and printed it on an Ultimaker. A couple of the gears had a gap or two at the outer center posts but all were usable. I've added a thicker version for anyone having trouble.

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License

More Brain Gears by elfnor is licensed under the Attribution - Creative Commons license.

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