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PLA printed gear for Rostock - 2mm pitch, GT2, 40t

by grabercars, published

PLA printed gear for Rostock - 2mm pitch, GT2, 40t by grabercars Jul 30, 2012
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A PLA printed gear/timing pulley with 40 teeth for GT2 timing belt 2mm pitch profile. Features a beefy 5mm nut/grub screw insert.


Printed at .25 layer thickness with a .5mm nozzle using PLA on a RapMan 3.2 printer. I had to adjust the depth profile of the teeth to make this fit properly but the finished product appears to grip my GT2 belts very well. This has not been used under powered condtions yet, so until I have a chance to finish building my own Rostock and to test these pulley I will call it a work in progress. 3 are required for a Rostock.

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Hi I need agt2 17tooth 5mm bore 2MM pitch and Thoth width is 6mm I believe can't find any on eBay or any where that ships to uk I need sum asp to replace Them

Some teeth come out clean some other not. Is it because of the makerware software? I'm trying 50% infill, 2 layers, 0.2mm My printer is calibrated and prints amazing nice but not this part

Printed on 0.4mm layer height, black abs. 0.15 infill

Any possibility of getting a source file for this model? I'd like to modify it to where it accepts an m3 screw / nut.

What is the point of the 5mm nut insert? What is it's function?

And how long does the grub screw need to be?

Upon closer inspection, I get the point of the nut and grub screw....but how long does the screw need to be??

Love it. This thing was a life saver. I kept getting bad GT2 gears for my Prusa. Printed this out right before the GT2 on my Y-axis broke. Replaced and it works like magic!

Also, you said you changed the depth of the teeth.. can you elaborate? How do you think this will affect the printed part, if say, I have it printed using shapeways sintering method? (Thinking of using their "white strong ang flexible" material)

If you are going to use shapeways then I would build the gear from Droftarts parametric file - http://www.thingiverse.com/thing:16627http://www.thingiverse.com/thi...

Parametric pulley - lots of tooth profiles

Cool! Let me know if it works well powered. I'm trying to build a rostock too.. Couldnt find a supplier for this part. I might just have it printed on shapeways.. :)

I had the same problem with the supplier being out of stock on this part, so I decided to try to make it on the printer. I think the more parts that can be printed the better, within reason of course.

Regarding the tooth profile in the provided file. The problem with having so many small teeth on the pulley is that the resolution of a .5mm nozzle falls short of extruding the correct profile unless the profile itself is modified to take into account the thickness of the extruded material. I real
ly just played around with the file profile and printer until I got a decent match with my timing belts. This particular pulley grips the belt really well.

You can actually make this same pulley using the excellent parametric pulley/gear by Droftarts for OpenSCAD at http://www.thingiverse.com/thinghttp://www.thingiverse.com/thi...
:16627 but you will want to modify the nut opening for a 5mm nut and the tooth profile shape will have to be messed with until you come up with the same thing I made in Solidworks. Mine obviously isn't parametric, it just works for the exact gear for the Rostock. :-D