Well my dad basically needs something to make his own custom designs as well as cut costs. He will be 3-D printing them using silver and gold since that is his primary business . We wont be 3-D printing at home tho. He has people who can do it if we have the design in .stl format with much better accuracy. Ofcourse setting the dimensions would also be a problem i think in blender. he says he will be designing earrings and pendants, nose rings etc whose designs we buy from other people. I searched around a bit and found that rhino would be more suitable but it's paid plus proprietary and there's no guarantee it will run on linux with wine