This video shows an old favorite triangle design from early Spirograph, done at full page size, using Wild Gears.
There are many other combinations of gears that give this triangle pattern. If the gear is exactly two-thirds the size of the ring, you’ll get a pattern like this.
Note that I’m using the smallest size holes, which are lined up in two rows. The second row gives lines that run between those made with the first row. Using both sets gives a dense pattern like this.