I saw this on Thingiverse and it looked simple enough to just drop in some acrylic and go. Then I took a look at the file… I mean no offense whatsoever to the original author: coming up with the design is the part that seems like magic to me. But these vector drawing programs are highly technical, and if you’re focused more on the art than on the data model, it’s pretty easy to create some weird paths. I spent a couple of hours trying to remove the glitches before realizing I could just draw the same thing from scratch in 10 minutes. Three cheers for Creative Commons allowing me to do that and re-share it. Here’s my version: https://www.thingiverse.com/thing:2561104
All in all, it was a good learning experience. Another decade or so of this, and I might be able to spend less time scrolling through the Illustrator help files and swearing at the screen.