I want to build one one of these, awesome 
Seems like a fun project!
I had something similar when I was a kid. It was a lot of fun to play with.
This is what I used as a kid 
Me too, I loved my Spirograph. GHI should have one!
Ooooh! Our .NET users’ group has a thing we do in the fall called “Geek Harvest” where we show off projects that we do with our kids over the summer. I may have just found my project. The youngin’s would love this!
Cool, but what happens when the pen runs out of ink in the middle of the drawing? 
- Replace pen
- Trace back (reversed order) until any gap is closed
This one takes a little different approach that wouldn’t require the spinning table. Little different results though.
@ Gus - The use of the magnets on the metal disks is brilliant. Adjustability and fail-safe in one part. Awesome!
[quote=“ianlee74”]
This one takes a little different approach that wouldn’t require the spinning table. Little different results though. …[/quote]
See also: http://www.polargraph.co.uk/ , which has been on my todo list for a while now… (porting it to .netmf, that is)
@ ddurant - I’ve seen that one before. Pretty cool if you have a big window like that to put it. I’m thinking one of these spirographs would be a cool project to hang on my kid’s wall 