A wall under 0,8 millimeters (with casting and lost wax) can't be 3D printed without risk of breaking.
Online 3D printers refuse under this limit.
For jewellery, casting is better than sintering for a soft rendering.
My local caster who works for jewellery gave me the same limits (0,8 mm).
I have to take care this limits with my creations.
I think sintering have bigger limits with 1 mm minimal limit.

Dimitri -

Great job on the ring. Hopefully you can have it cast and show the results here.

I design and make rings for a living. My technique is a bit different than casting. Because I make rings from titanium, I have to machine them with a CNC lathe and CNC milling machine, rather than cast. That limits me to simpler designs. I use MoI to produce renderings, and I use software I designed to create the G-Code for the machines.

I do use a 3D printer to produce custom ring sizers for customers. Michael wrote a MoI script for me where I create a 2D profile, enter the ring size & width, and MoI builds a set of 5 rings sizers in half-size increments. It's a real time saver. http://moi3d.com/gallery/viewitem.php?id=908

Your ring would also probably do OK on a 3D print. Look at examples printed in metal by Materialise.
https://i.materialise.com/en/shop/category/jewelry/rings
https://i.materialise.com/blog/3d-printed-jewelry/
https://i.materialise.com/blog/best-3d-printed-jewelry-year/
https://i.materialise.com/blog/a-look-into-da-capos-amazing-jewelry/

Ed Ferguson

Phiro and Ed, thanks a lot for the so valuable information! Really, the issue of the detail amount on a model that will go for printing is a very important issue. I do not have any experience yet on those matters, I have to do my first tries in printing -I do not have any printer, just thinking to order some on the available web stores- and see what is going on. One reason that I do avoid making too detailed designs is exactly this: not being sure of what the existing, nowadays, printers are capable of.

Below another try, this time even more simple in its design. It is very slightly 'touched' by the deformation cage in Rhino, but other than this everything has been done in Moi:

The 3D printing services will have Design Guides for each material offered. The guides show minimum wall thickness, minimum hole diameters, minimum clearance between two parts of a model, etc.

An example is here:

https://i.materialise.com/en/3d-printing-materials/design-guides

Ed Ferguson

Thanks a lot Ed! As far as I see the detail limits in some materials reach even some 0.25 mm thicknesses. This means that there is a lot of freedom to do highly detailed modeling. Of course, there is the problem of polishing in the cases of too complex details. But, anyway, this is something that can be dealt with a careful planning in design.

Beautifully done! Wow.

Fantastic work!

Thanks Vegasguitars! I am following the discussion going on in your guitars thread! So many things to learn there! : - )

Now that I did see your message it is time to put here another ring making try... working in Moi on simple shaped rings, with smoothly flowing belts and motifs on them, is really a joy! Below there is an experimentation with translucent materials too. Wish to hear opinions from people here... both about the aesthetic side of the results and the technical possibilities of producing them with materials of actual life. Because it is easy to depict them with such materials in digital renderings but I am not so sure if it is possible to produce them in real life too. : - )))