I made a sidewalk-sized spirograph. It’s pretty off-topic as far as this site goes, but so many people asked me for the template (via Haha Bird) that I decided to post the storyline here so they could find it.
So. Much. Fun. Well worth the 30 hrs work, and some more tweaking over the winter. I might be willing to bring it to you for a visit. Just ask. Made with help of my friends at Kingston MakerSpace.