Inspiration from https://www.thingiverse.com/thing:5351192，and my family need rulers in centimeters.

This seam allowance ruler allows you to quickly place a magnetic seam guide on a sewing machine by lining up the needle with the seam allowance measurement you'd like and then placing the magnetic guide on the edge of the ruler.

The Seam allowances range from 0.3 cm to 0.7 cm in 0.2 cm increments, and from 1 cm to 5.5 cm in 0.5 cm increments.

The picture below shows the exact dimensions of the holes in this ruler。（『毫米』means『millimeters』

通过这把缝份尺，您可以在缝纫机上快速放置磁性缝份导轨，只需将针对准您想要的缝份尺寸，然后将磁性导轨放在尺子边缘即可。

接缝余量从 0.3 厘米到 0.7 厘米，以 0.2 厘米为增量；从 1 厘米到 5.5 厘米，以 0.5 厘米为增量。

下图为该尺子孔位的具体尺寸