Need help with simple ring design

I need to produce a design file of a simple ring:
thickness 0.8 mm
outside diameter 37 mm
inside diameter 36 mm

I tried using TinkerCad but the polygon resolution was too low and the ring ended up faceted.

Can someone help by generating this simple file (.stl seems to be the preferred format for the print shop) so I can get the part produced.

Thank you!

here you go. STL will always result in facets as the file is made of triangles. this one is really high resolution though.

THANK YOU!

no problem. send me a message if you have any harder work you need done.

Feel free to ask me for help too. I'm always willing to help.