I have used PLA and PETG. Of these I prefer PETG. Its a little harder, and gets a better finish when sanded.
I’m prototyping in PLA. My plan is to print final in Nylon. I’ve been getting good prints so far. That said, I have some PETG on hand and I’ll try my next prototype in that.
You didn't by chance print that evotion in your profile did you? Been interested in those but not the $500 price tag.
Filament depends on your printer as not all printers can handle everything Also it depends on your taste, maybe some hard flexible? What you need to focus is that it is not brittle, many PLAs are which means they will break without any warning so normally ABS or nylon are a good choice, they will deform before breaking so at least you can know if they will break or not
That is an old holly trainer. However, I am working through prototypes based on the evotion design. I have a titanium pin from them. I am re-using and end-cap and have designed the bijou like tube. I'm working through different ideas to get a good fit for myself. Purchased devices work OK, but I can always see how they could be made better. Even just moving one bar by 2mm. Now that I can print parts, I can do the iteration. Eventually, I'll move away from the evotion design. I didn't like having the lock below the PA pin. It resulted in urine in all the parts. I'll move the lock to the base, like rigid chastity designs. The green is PETG. I don't like it. PLA is easier to print and is smoother. Plus, every time I print PEGT, I need to clean the nozzle. Maybe I needed to clean the nozzle anyway, but it was not a problem until switching back from PETG
My printer seems to like PET-G. I usually prototype in PLA, and then print the "final" cage in PET-G. Then post-process by sanding / polishing. So far it's working fine. And I agree, it's nice to have the ability to say "hmm, this could be a little shorter here" or "what if I did this".
The PA pin was made by emotion. it is their titanium pin. An expensive piece, but now I’m able to repurpose it. The device end piece is also from emotion. However, I’ll soon redesign that for more coverage.
I got a quote from PCBWay for a 3D printed pin in 316 Stainless - it was around £30. I have no idea of the quality of finish etc.
PETG all the way. It is slightly more flexible than PLA, but still stronger. It also sands so much better so you can get a decent finish even if your printer isn't 100% dialed in.