Where can I, or should I, get metal parts 3d printed?

I've been wanting a Male to male ring with 39mm filter thread on one side, with 52mm filter thread on the other (0.75 MM pitch). It's important that the material might need to be metal, because plastic might not hold up. I'm not quite sure how to find someone who is able to make such an object. 
It's for attaching two lenses together, and should be able to support about 460 grams. Basically, a macro coupler which I've not found online ready.

MacM545 wrote:

I've been wanting a Male to male ring with 39mm filter thread on one side, with 52mm filter thread on the other (0.75 MM pitch). It's important that the material might need to be metal, because plastic might not hold up. I'm not quite sure how to find someone who is able to make such an object.
It's for attaching two lenses together, and should be able to support about 460 grams. Basically, a macro coupler which I've not found online ready.

There's an online designer here, and then RafCamera will make the part for you:

https://rafcamera.com/custom-adapter

I've never used the company myself, but they do seem to have a good reputation.

Update: There's at least one more thread about this tool:

https://www.dpreview.com/forums/thread/4630278

Heritage Cameras wrote:

MacM545 wrote:

I've been wanting a Male to male ring with 39mm filter thread on one side, with 52mm filter thread on the other (0.75 MM pitch). It's important that the material might need to be metal, because plastic might not hold up. I'm not quite sure how to find someone who is able to make such an object.
It's for attaching two lenses together, and should be able to support about 460 grams. Basically, a macro coupler which I've not found online ready.

There's an online designer here, and then RafCamera will make the part for you:

https://rafcamera.com/custom-adapter

I've never used the company myself, but they do seem to have a good reputation.

Update: There's at least one more thread about this tool:

https://www.dpreview.com/forums/thread/4630278

Yeah.  Threaded parts like this are really not well matched to 3D printing - it's possible but extremely difficult, compared to any metal shop with a competent lathe operator, especially one with a competent CNC lathe user.

Entropy512 wrote:

Heritage Cameras wrote:

MacM545 wrote:

I've been wanting a Male to male ring with 39mm filter thread on one side, with 52mm filter thread on the other (0.75 MM pitch). It's important that the material might need to be metal, because plastic might not hold up. I'm not quite sure how to find someone who is able to make such an object.
It's for attaching two lenses together, and should be able to support about 460 grams. Basically, a macro coupler which I've not found online ready.

There's an online designer here, and then RafCamera will make the part for you:

https://rafcamera.com/custom-adapter

I've never used the company myself, but they do seem to have a good reputation.

Update: There's at least one more thread about this tool:

https://www.dpreview.com/forums/thread/4630278

Yeah. Threaded parts like this are really not well matched to 3D printing - it's possible but extremely difficult, compared to any metal shop with a competent lathe operator, especially one with a competent CNC lathe user.

I agree subtractive maching can do this better.

However, it's not "extremely difficult" for 3D printers using standard PLA plastic. Standard filter threads are 0.75mm pitch, and that's definitely tight for commodity 3D printers, but printing slowly with thin layers (0.2mm or less) can give virtually 100% successful prints. Supporting 500g isn't a big problem either, but remember that 3D prints fail most easily by layer separation, so I recommend printing a little hot to get better bonding between layers. Also remember that 3D prints start to soften at relatively low temperatures; a printed adapter left sitting on the sunny rear deck of a car at 140F is likely to suffer some structural deformation.

It is also possible to cheat and print compatible threads that have tweaked geometry to make them print better, and I always used to do that, but I've found it hasn't been as necessary with more modern 3D printers as it was with most 5+ years ago. Frames have gotten stiffer, drivers are better, and tolerances on cheap printers have thus improved.

HeavyTeva wrote:

Have you considered combining a 39mm to 52mm step up ring and 52mm male-to-male macro coupling ring? Both are readily available in aluminum and much cheaper than a custom machined part.

Yes. It won't work properly anyways, because of the way the lens I was wanting to use (7artisans 60mm) has been designed. Without going into detail, the special order macro coupler also doesn't work for this lens. I don't know what to tell RAF camera, as they made a special adapter for me which took them about three weeks, but it doesn't work.

MacM545 wrote:

HeavyTeva wrote:

Have you considered combining a 39mm to 52mm step up ring and 52mm male-to-male macro coupling ring? Both are readily available in aluminum and much cheaper than a custom machined part.

Yes. It won't work properly anyways, because of the way the lens I was wanting to use (7artisans 60mm) has been designed. Without going into detail, the special order macro coupler also doesn't work for this lens. I don't know what to tell RAF camera, as they made a special adapter for me which took them about three weeks, but it doesn't work.

Ah... the other reason to have 3D printed it: rapid prototyping. Find out faster that what you're trying to do will not work. 

Heritage Cameras wrote:

MacM545 wrote:

I've been wanting a Male to male ring with 39mm filter thread on one side, with 52mm filter thread on the other (0.75 MM pitch). It's important that the material might need to be metal, because plastic might not hold up. I'm not quite sure how to find someone who is able to make such an object.
It's for attaching two lenses together, and should be able to support about 460 grams. Basically, a macro coupler which I've not found online ready.

There's an online designer here, and then RafCamera will make the part for you:

https://rafcamera.com/custom-adapter

I've never used the company myself, but they do seem to have a good reputation.

Update: There's at least one more thread about this tool:

https://www.dpreview.com/forums/thread/4630278

I have had stuff made and also purchased from RAF. Aside from the current geopolitical issues, they do a great job. There is also Gerd Neumann https://www.gerdneumann.net/english/ I have had make things for me.   He is great to work with, and very quick.