Thanks for the complement, I really love it too. Ever since I made it I’ve been spinning it every day.Far too addicting so I’m making more air powered tops. The polishing did absolutely remove material from the print. I originally got the print via shapeways, it was their bronze coated steel, with really retains almost every detail… I was impressed with my first steel prints. So it was brown, and the inside of mine (in the video) is still brown and I like it a lot. It also had a small tooling mark from the support material being cut away. I spun it on a lathe and polished it to my satisfaction, removing at least .5mm from the surface and any trace of the tooling mark. The top spun quite a bit better the polish, but only really needed it for looks. I don’t think you could hand polish the steel quite like this, but this design was easy to clamp into the chuck for polishing. I ended up using a file to clean up the line around the outside too, the polishing started to cut into it, but I wasn’t ready to stop because of that tooling mark.
So, in summary… Shapeways does lightly polish their steel, you don’t lose very much detail, hardly noticeable to me. But, their steel material will also have one hidden tooling mark on it some where from them removing the support material or something like that. Some times you can’t find it right away but it’s there if you look hard. If you decide you want to polish that tooling mark off, you will then start to lose some notable resolution in your model.
Cheers @bdurack. Let me know if you think of anything else you wanna ask.