Yes — more so than almost anyone expects, and considerably more than cast silver in the ways that matter for jewelry. But it fails in its own particular manner, and you should know what that looks like before you buy.
Sintered nylon is not the brittle plastic people picture. It is the same family of material used for functional engineering parts — hinges, clips, housings that get handled daily. It is tough rather than hard, which is a distinction worth holding onto: it absorbs impact by flexing slightly instead of resisting it and then cracking.
The practical result is that a printed piece survives being dropped on a tile floor. A thin cast silver element in the same shape might bend permanently. An enamelled or resin piece might chip. Nylon usually just bounces.
Abrasion. This is the real one. The surface is finely matte, and sustained rubbing against something hard will eventually polish and then wear it. A piece kept loose in a dish with metal jewelry, or rattling in a bag, will show it first at the edges. This is entirely preventable with a pouch, and it is the single most useful thing to know about living with these pieces.
Prolonged direct sunlight. Dyed nylon, like most dyed materials, will gradually shift in tone under months of strong UV. Wearing a piece in the sun is fine. Leaving it on a windowsill all summer is not.
It will not stretch back into shape if you deliberately deform a thin section past its limit — though you would have to be trying. It will not take a high polish; the matte surface is inherent to the process, not a finish that can be buffed away. And it cannot be soldered or resized the way metal can, so sizing matters at the point of purchase.
Against cast silver, printed nylon wins on impact, on weight, on tarnish and on what shapes are possible at all. Silver wins on surface, on repairability, and on the simple fact that it can be melted down and remade.
They are different materials doing different jobs. The nylon pieces here exist because the forms could not have been made any other way — not because nylon is a cheaper way to make something you could have cast.
More on the process in how these pieces are made, or see the 3D printed collection.
All of these are collected on the 3D printed jewelry page.