We make a lot of our guards out of clear PETG. Each of our guys tends to do a slightly different finish on the edges. Not a big deal as they are only guards on a piece of plastic's machinery.
BUT... On the M3W as Ken pointed out, it looks unfinished on the top. You can also see that the left section does not have rounded de-burred edges, but just squared off as cut. The right side has been finished by sanding the edges round for a more finished look. So two people must have finished these, one for each side it would seem.
We do all of our clear plastic cutting on our waterjet, even the 5/16" clearance bolt holes get cut on the waterjet. The finish on these look similar to our waterjet finish, especially the left side.
