the ruler is designed with a system of holes that guide your pencil along a 90 degrees angle from the edge of the surface. the holes are spaced at a precise 1 mm spacing.
| 100_mm_ruler.STL | 1.5MB | |
| 100_mm_ruler_letters.STL | 911.0KB | |
| 150_mm_ruler.STL | 2.3MB | |
| 150_mm_ruler_letters.STL | 1.4MB | |
| 200_mm_ruler.STL | 3.2MB | |
| 200_mm_ruler_letters.STL | 1.9MB |
