If you’ve ever tried to clean clogged windshield washer nozzles, you probably know just how small the spray holes can be; less than .4mm in some instances.
So where do you find such small needles for cleaning? 3D printing!
In 3D printing, the extruder nozzles range from 0.15mm to 0.8mm and require semi occasional cleaning and dislodging. Because of this, there are many kits available for this very purpose.