Spur gears for Printrbot Wood Extruder
by olawlor, published
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Â 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!"
I cheated and used Skeinforge from ReplicatorG's simpler interface.Â 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.Â 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.
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. =(
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It's a derivative of:
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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