This is a 16 tooth Oval gear for the Spirograph frame by 3Domas... and should fit the variants. It was a bit challenging to add an oval to a ring with such large teeth, but I got it to move smoothly without snagging and it does pretty well. Looking at my desk.. this was version 4 as I had to do some unique adjustments to most of the teeth.
Oval's in a round ring will give you flats before turns and adds larger swings as your center goes closer and further from the edge no matter what position you pick.
I really like this spirograph frame set. It is easy to handle and its a great gift. I recently started printing a layer of TPU on the bottom to reduce slipping which makes it even better.
Get the snap-ring and numbered gears here. https://www.thingiverse.com/thing:4853283
...and of course the frame ring assembly and round original gears can be found https://www.thingiverse.com/thing:905849
The author marked this model as their own original creation.