a. Colour Changes
Where in it can take many shots for the colour to change and the older colour keeps coming as pigment / spots / dots in the newer coloured shots
b. Resin Changes
Where in it can take many wasted shots before the older resin stops coming in the newer resin
c. Preventive Machine Maintenance
Where in black spots / dots can keep appearing in the injection molded material on restart of machine after preventive machine maintenance.