Criar renderings 3D

Objective: design a ready to 3d print (to input in [login to view URL]) shank button in a shape of a Hikotatsu_Honyaki knife with the right size proportions of a real knife. The button will be sewed to a clothing piece. I have done some research and found the real knife sizes in attachment and tried to get the right proportions for the button. There are some restrictions or limitations for printing, related to the materials. Maybe you can help me with that as well. Details should not be thinner than 0.5 mm. Detail: the Knife is as presented in the picture. the purpose is to get this knife that measures a total length of 487 mm (157 mm + 330 mm) into a 60mm length knife (details in attach). the knife grabber has 8 sides - octogunus - higher than wider. the blade is thicker on top and at a certain height starts to get sharper. that creates a subtile line that is a bit curve that goes along the whole blade. that detail should be on the blade, as a real knife. the curve of the blade start is curve as in the model knife in the picture in attachment. blade edge stays at the same level of the lowest part of the grabber the shank button work - the purpose is to design a ring or a hoop together with the knife so it can be stictched to a clothing garment. as the material for printing will be the same along the knife, there will be more weight in the grabber, so I would suggest that the ring is located closer to the grabber and vertical to the knife lenght so it keeps the button equilibrium when in use. the document "digitalizar 0001" - refers to a possible measures for the ring that will be together with the knife. Please, do not mind the relative measures for the location of the piece itself in the knife. Thank you in advance for your patience and interest. Hugo