The filament diameter of plastic thread is measured in cross section. Usually it is 1.75mm or 3mm. You can find this value on the package of plastic filament.
![](https://support.anisoprint.com/wp-content/uploads/2018/12/Filament-diameter.jpg)
The filament diameter of plastic thread is measured in cross section. Usually it is 1.75mm or 3mm. You can find this value on the package of plastic filament.