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Spur gear for PB Wooden Extruder

by Gecko, published

Spur gear for PB Wooden Extruder by Gecko Aug 29, 2012
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Summary

I made this derivative with a thinner hub to use with my PB wooden extruder. I found the gear didn't position the hobbed section of the bolt correctly for the hotend.

Instructions

I printed with one shell at 10% infill because I needed it in a hurry.

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Could yiu please add the little gear aswell? I see that other people made the little gear aswell but I can't seem to dind the file. Thanks alot for making this!

Import into Tinkercad then export as .stl. For some reason that works like a charm for hole errors on .stl files from Thingiverse.

I ordered this from Shapeways - it works great! My old gears were kind of a mess, these seem much more precise. Put them on my Printrbot classic with the wooden extruder.

I got the following error loading this into Slic3r:

Warning: The input file contains a hole near edge 25.000000-26.000000 (not manifold). You might want to repair it and retry, or to check the resulting G-code before printing anyway.

And sure enough, Pronterface only printed the rim. Seems like a similar error was discussed for the gears that this is derived from.

Thanks anyhow for making this!

Hi, thanks for creating this gear. I was slightly annoyed by the fact that the hobbed section of the bolt wasn't centered on the wooden extruder.

However, I now have the same problem - just in the opposite direction :) I mean, the hobbed section is off-center again, but to the other side now. How do you install yours? I put in a single M8 washer under the gear. I did't try using 2 washers but I suspect that would be too much anyway.

I guess I'll have to try Solidworks :)

Yeah, the hobbed section was off in the wrong direction for me as well. As you said, a washer makes it align perfectly. I also had to run the STL through Netfabb to fix the manifold errors, else the hub didn't print.

Can you send me your repaired STL and I'll replace the current file.
I haven't had any problems slicing in replicator G to run on a makerbot or through early Slic3r to run on my printrbot but that doesn't mean it will always work for everyone.

FWIW, I just printed one for my wooden extruder and it seems to be centered just about perfectly. Using one washer.

I put one washer between the bearing and the gear, I don't know if it is perfectly aligned in mine but it works brilliantly so far.

How much is your off by? I can bang you out another one with a different hub thickness if you need it.

Matt

Nice job. I like the nice big radius between the rim and thinner spokes.

Thanks for posting your original in solidworks format, that made it a 10 minute job to design this one. Your spur gear design works really well too, no backlash and the extruder motor isn't working as hard. I also covered both gears in a Teflon based grease, super smooth running now.

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