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Tamron AF 70-300mm replacement zoom ring — image 1
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Tamron AF 70-300mm replacement zoom ring

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Tamron AF 70-300mm f/4-5.6 Di LD Macro replacement zoom ring

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Recently I got a Tamron AF 70-300mm f/4-5.6 Di LD Macro where moving the zoom ring wouldn't do anything, though you could move the zoom manually. I also heard something loose in the lens which turned out to be a little arm that would move the lens out. This was broken off and my only option was to either get a broken lens or to reverse engineer it. I decided to take the challenging route to reverse engineer it and to my surprise it works perfectly so far. I printed this model in ASA and PETG and both seem to hold up pretty well. Of course since the arm that moves the zoom ring is quite small, stronger filaments are recommended. 

I hope I can help someone repair their lens with this model :)

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