When I sent some measurements to my uncle to make a bed, I sent it in 200cm x 160cm. Not 2m or 20 dm. You know those exchanges because it’s obvious but since people are used to cm for height, it’s useful to compare stuff with yourself and that’s why cm is the most used measurement for craft.
If whatever you are building fits in a hand, measurements will probably come in mm, because idk why but people enjoy 3 digit measurements.
When I sent some measurements to my uncle to make a bed, I sent it in 200cm x 160cm. Not 2m or 20 dm. You know those exchanges because it’s obvious but since people are used to cm for height, it’s useful to compare stuff with yourself and that’s why cm is the most used measurement for craft.
If whatever you are building fits in a hand, measurements will probably come in mm, because idk why but people enjoy 3 digit measurements.