Your welcome. Most jewellery designed in cad is cast using 3d printer resins as you know. That is what I do, design, print & cast in house.
Your enemy in a lot of cases with casting resins is sharp edges especially in the very fine sizes we work with for jewellery. Firstly because they look ugly in render/design and secondly because those sharp edges can break off in the casting investment and ruin your metal. Resins are harder on casting investment than wax.
In plain Rhino filleting edges is the solution. Now do a search for filleting problems on this forum. Sub-d produces filleted edges so easily.
Both Clayoo and T-splines run inside Rhino …and McNeel are working on Sub-d for later versions. If you are making any sort of money in CAD Jewellery sub-d pays for itself in a week or even a day IMO.
This ring is 100% t-splines. The green lines are symmetry planes in the geometry…quad symmetry on the band and both axial and radial symmetry applied to the setting. The whole model updates live as you work on a section. Less than an hour to make. Changing the ring size or setting size later is too easy.
Good Rhino skills are a must first IMO… but if you are serious about making jewellery fast then sub-d is also a must for the tool box. Paying for t-splines was the easiest spend I ever made as a business owner. I make almost everything in sub-d now. Good luck.