1) A grind that is too coarse, an inadequate amount of coffee, or insufficient tamping of the grounds prior to brewing can result in insufficient pressure, affecting the quality of the brew.
2) It's essential to understand that the volume of espresso produced will differ based on both the grind size and quantity, and adjustments to the settings may be necessary when these factors are modified.
Wash in warm, soapy water before first use and dry thoroughly.