I would like to 3D Print some O rings to store some of my coins using TPU filament. From my research, TPU is a polyurethane which has no PVC, however I’m still unsure. Does anyone know if my coins will be okay?
Wow, you just love your coins more than I do. I just use Saflips and call it a day. I honestly do not know about TPU sir. I hope someone on here does.
Aromatic no, Aliphatic, no. Filament form is most likely aliphatic, I would think, and filament is polyester based, and I would want a specific O Ring formulation that the manufacturer has prepared for the final intended use. Non PVC content is not the only concern in this situation.
Polyurethane isn't a polyester. It looks like it might be safe -- it's used as a coating to prevent metal corrosion -- but I don't know if filament has any added materials that might be harmful. You could print a few, put fresh Zincolns in them, put them out in the warm sun, and see what happens...?
Thanks for the kind words! Normally I wouldn’t do this, however I’m creating a custom page for my Dansco 7070 in which all the slots are 36mm. Of course not all coins are 36mm so i’m trying to 3D print these O rings so that they can all safely and securely fit in the page.
Soft segments can be polyether or polyester type. Maybe don't answer so fast without actually knowing. A good place to start would be the American Chemistry Council. You may actually enjoy learning about Thermoplastic Polyurethane (if you have the time. It took me 19 years. I was a slow learner. Shot spitballs a lot during exams). I do appreciate the help, though. The more....opinions....the better.
YW. Don't listen to me. I am made up from a bunch of stuff nobody knows about. Try it. Enjoy and have fun. It is how we learn. Never fear being wrong. I never worried about it. I can live with that. I don't know anything about 3D printers that would be worthwhile in giving advice.
