Question

material jetting printer parameters
why is periodic maintenance needed when using a material jetting printer?
because the resin heater has issues very often
because the system controlling the pressure builds up a white residue that has to be removed
because the printhead is very small and needs to be cleaned to prevent clogs

Explanation:

The text mentions that the printhead of the Material Jetting printer is very small (16 microns) and frequent maintenance is needed to avoid clogs and keep a steady flow of resin. So the reason for periodic maintenance is related to the small - sized printhead and preventing clogs.

Answer:

because the printhead is very small and needs to be cleaned to prevent clogs