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Simplified Printrbot Spur Gears

by jameswood, published

Simplified Printrbot Spur Gears by jameswood Jan 12, 2013

Description

Simpler gears for the Printrbot.

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.

Recent Comments

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I had the opposite - I had to drill them out slightly. Good luck with yours!

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.

Be not confused: they don't ship printed gears anymore.

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Instructions

The Blender file and the STL each contain the large and small gear. Slic3r is able to split the file into individual gears if you only need one of them, or if, like I had to, you have to print via USB and the connection can't handle the amount of data. After I printed these, I finally got an SD card and it changed my life. Do it. Do it. These gears (and other complex models) print so much better from an SD card.

Comments

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mza1979m on Nov 3, 2013 said:

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.

jameswood on Nov 4, 2013 said:

I had the opposite - I had to drill them out slightly. Good luck with yours!

SwimmingNaked on May 30, 2013 said:

I'm confused...my Printrbot LC came with wooden spur gears, not printed helical.

jameswood on May 30, 2013 said:

Be not confused: they don't ship printed gears anymore.

thanhTran on May 3, 2013 said:

I'm building this. I really like the look of this big gear.

Could I have a pinion that has 4mm hole instead of 5mm please? I'm trying to import the stl file and edit it in SketchUp, but I can't find a way to find the center of the pinion so that I can align a liner tube that I draw separately. Any pointer is appreciated.

Thanks

jameswood on May 4, 2013 said:

Hey dude! Try using the Tape Measure tool in sketchup. It will snap to the centre of a line and should help you to find the centre of the hole.

Good luck... Post your derivative when you finish it!

parachutefactory on Apr 29, 2013 said:

I have been running these for about two months and love them! These are definitely better performers over the (poorly) molded gears that my LC shipped with. Thanks for posting them!

jameswood on Apr 30, 2013 said:

Awesome, thanks for the feedback! Mine have lasted far longer than the standard gears (I'm still on my first set of these, printed way back when!), mostly because, unlike double-helicals, perfect alignment isn't important with spur gears.

nepaholic on Jan 19, 2013 said:

i love these gears. work awesome on my junior

zattara on Mar 31, 2013 said:

Hi Nepaholic, did they make a difference on your jr. quality when printing. I'm expecting my junior in a couple of days and trying to figure out what, if anything, I need to upgrade/change.

Thanks

jameswood on Jan 20, 2013 said:

Awesome! As far as I know, you're the first person to make something I've uploaded. High five!

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