Keith,
3D printing is a great technology. I use it to make prototypes for tooling to make medical devices, and sometimes for actual, functional tooling. But there are limitations. The most common material we use is ABS plastic, which is reasonably strong but does not have the flexibility of nylon or PVC (which I suspect was the original material for the clip in question). Perhaps the biggest drawback is appearance. FDM (fused deposition modeling) printing builds the part up in layers These layers are .010" or so, and while that's small, it's not invisible. The material is also porous due to gaps betwen the layers and the way each layer is built. Lastly, the part can fracture or cleave between layers, so the part is generally built to minimize this effect, which sometimes compromises appearance.
The original parts were extruded. Extruding dies are simpler to make than injection molding dies, but you're still talking thousands of dollars. Let's say you get a bargain at $3,000. There's setup time and development, and machine time to pay for. So you're probably looking at $5,000 minimum investment. And my numbers are probably on the optimistic side. Once you start running the piece price is pretty low. Let's say you make 1,000 clips. At $5 apiece, you break even if you sell them all. What do you expect the demand to be? If the market will only support 200 clips, you need to sell them at $25 apiece just to break even. None of this factors in the time for marketing, sales, shipping, etc.
The choice is, a functional part that sorta looks like the original but is inexpensive, or a quality reproduction that is rather spendy.
If you're looking for a "close enough", a company called Heyco makes a C clip that is similar in appearance. It's part number 3794. But I haven't found any for sale, you might have to get quotes. (Companies offering quotes are usually expecting to sell quantities, not individual pieces) Heyco and others also make "J" clips, which may be close enough to be functional.
