<p>It is an "aluminum timing  pulley"</p>

<p><a href="https://www.google.com/search?psb=1&amp;tbm=shop&amp;q=aluminum%20timing%20pulley&amp;ved=0CAMQr4sDKAFqFwoTCMis1KHmiuMCFRoMswAdMqUElxAB" rel="nofollow noreferrer">https://www.google.com/search?psb=1&amp;tbm=shop&amp;q=aluminum%20timing%20pulley&amp;ved=0CAMQr4sDKAFqFwoTCMis1KHmiuMCFRoMswAdMqUElxAB</a></p>

<p><a href="https://www.ebay.com/i/152446519860?chn=ps&amp;var=453435947176" rel="nofollow noreferrer">https://www.ebay.com/i/152446519860?chn=ps&amp;var=453435947176</a></p>

CC BY-SA 4.0
2019-06-27T23:13:30.080Z
2019-06-27T23:19:36.940Z
2019-06-27T23:19:36.940Z
K Mmmm
<p>This is a timing belt pulley.</p>

<p>Specifically, is a GT2 timing pulley, 2&nbsp;mm pitch (between teeth), 6&nbsp;mm wide. The drive diameter is measured by the number of teeth (16 in this case) , the shaft diameter (bore) is measured in mm.</p>

<p>The 'GT2' part refers to the tooth profile, some other examples are shown half way down <a href="https://www.pfeiferindustries.com/timing-belt-identification-and-replacement" rel="nofollow noreferrer">this page</a>.</p>

CC BY-SA 4.0
2019-06-29T06:48:00.767Z
More specifically, it is a 16 teeth GT2 timing belt pulley.
0scar
CC BY-SA 4.0
2019-06-28T07:44:41.173Z
2019-06-29T22:10:43.567Z
2019-06-29T22:10:43.567Z
Sean Houlihane
<p>How should I describe this part which looks like a small gear so that I can research replacements?</p>

<p><a href="https://i.sstatic.net/51BdD.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/51BdD.jpg" alt="image of a pulley"></a></p>

<p>This came with my FLSUN 3D printer, which may be based on a Prusa design.</p>

CC BY-SA 4.0
2019-06-27T23:15:20.737Z
Not sure I understand your question. It's the driven gear for the belt which either drives the X-axis or Y-axis depending on to which drive motor it's attached. Is that what you're asking?
Pᴀᴜʟsᴛᴇʀ2
CC BY-SA 4.0
2019-06-27T23:19:02.820Z
Thanks I just realized how unclear that was. I was asking the product name of this part. So that I could do my own research and find where to purchase a replacement. My 3D printer kit was missing one.
K Mmmm
<replacement-parts><part-identification>
What part is this? Circular threading spool gear, about 10 mm diameter
K Mmmm
# What part is this? Circular threading spool gear, about 10 mm diameter

(Asked by: username_0 on 2019-06-27)

How should I describe this part which looks like a small gear so that I can research replacements?

[![image of a pulley](https://i.sstatic.net/51BdD.jpg)](https://i.sstatic.net/51BdD.jpg)

This came with my FLSUN 3D printer, which may be based on a Prusa design.

**Tags:** replacement-parts, part-identification
> **Comments:**
> **username_1**: Not sure I understand your question. It's the driven gear for the belt which either drives the X-axis or Y-axis depending on to which drive motor it's attached. Is that what you're asking?  
> **username_0**: Thanks I just realized how unclear that was. I was asking the product name of this part. So that I could do my own research and find where to purchase a replacement. My 3D printer kit was missing one.  

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## 2 answers

### Answer by username_2 on 2019-06-28. Score: 8 | Accepted answer

This is a timing belt pulley.

Specifically, is a GT2 timing pulley, 2 mm pitch (between teeth), 6 mm wide. The drive diameter is measured by the number of teeth (16 in this case) , the shaft diameter (bore) is measured in mm.

The 'GT2' part refers to the tooth profile, some other examples are shown half way down [this page](https://www.pfeiferindustries.com/timing-belt-identification-and-replacement).

> **Comments:**
> **username_3**: More specifically, it is a 16 teeth GT2 timing belt pulley.  

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### Answer by username_0 on 2019-06-27. Score: 1

It is an "aluminum timing pulley"

<https://www.google.com/search?psb=1&tbm=shop&q=aluminum%20timing%20pulley&ved=0CAMQr4sDKAFqFwoTCMis1KHmiuMCFRoMswAdMqUElxAB>

<https://www.ebay.com/i/152446519860?chn=ps&var=453435947176>


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