Simplified Printrbot Spur Gears
by jameswood, published
The intricate details inside the original gears were taking too long to print, so I simplified the design. This version also makes it a lot easier to adjust the motor mounting screw.
These are spur gears, not double-helicals. Double-helical gears (as supplied with the Printrbot) have a more even rotational speed than spurs, but they do need to be perfectly aligned. In a pair of double-herringbones, one gear is meant to be able to move on the axle so that they can self-align. This is not possible with current extruder designs, so they wear far more quickly than their equivalent spurs.
These spur gears have been working wonderfully on my Printrbot+ and have hardly worn at all. The original double-helicals needed replacing far earlier than I expect these will.
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I printed these but the center holes in both gears were too big for the bolt/motor shaft. There is a tiny bit of play in both of them and I'm worried this will have a negative affect on prints due to backlash. I superglued everything to eliminate all play and am waiting for them to dry. We'll see if that works.
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