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

3D Printing 3D Printer Parts

Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

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

grabercars

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Published on July 30, 2012

Description

A PLA printed gear/timing pulley with 40 teeth for GT2 timing belt 2mm pitch profile. Features a beefy 5mm nut/grub screw insert.

Instructions

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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vector010 on April 29, 2013 said:

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!

heyarn on July 31, 2012 said:

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)

grabercars on July 31, 2012 said:

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

heyarn on July 31, 2012 said:

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.. :)

grabercars on July 31, 2012 said:

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/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