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Spur gears for Printrbot Wood Extruder

by olawlor, published

Spur gears for Printrbot Wood Extruder by olawlor Nov 16, 2012
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Summary

This is a single-plate little and big gear extruder gear replacement set for the Printrbot Wood Extruder. It's working well on my PB Plus.

Instructions

I printed this with 0 extra shells, 100% infill, and it seems quite sturdy and reliable on my Printrbot Plus--in fact, it's extruding right now!

It's a derivative of:
http://www.thingiverse.com/thing:26243
I deepened the hex head hole, to put the hobbed bolt teeth at the right depth. There's a little spare depth for a thin washer between the gear and extruder, so if the gear is a little warped, it will still turn cleanly.
If your extruder is a little goopy, like mine, and it prints interior holes undersized, you may need to drill out the center hole to 5/16 inch, and/or chisel some clearance around the hex head. A sharp 1/4 inch wood chisel works well for this.

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What are you slicing with? I'm having problems (different, but equally annoying) with both Slicer 096 and 072b.

With 096, the tip of every tooth has a tiny < 1mm length of extrusion that ends up lifting my part off the hot bed.

With 072b, I can't get it to fill the hex area that holds the hobbed bolt head, which would probably end up being flexible and weak as its only 1 perimeter thick.

Ive also had bad luck slicing anything with Skeinforge and Kisslicer. =(

I cheated and used Skeinforge from ReplicatorG's simpler interface.  That is one crazy complex program.

But I just checked and these gears did print fine sliced from Slic3r 0.9.6 to my Printrbot.  Just set perimeters==1, and disable the "Generate extra perimeters" checkbox to keep the weird gaps from the tip of each tooth.

I do keep my heated build platform (w/ Kapton top) to a blazing 110C, but it makes ABS stick like crazy, so I haven't had any problems with lifting or even curling.

 So I just spent essentially the entire day trying to figure out skeinforge. I think I got it. Posting pics of my gears under "made one!"

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