1) Incomplete Fillings:
a) not enough resin to fill the mold completely
b) inadequate injection stroke
c) low injection rate
d) low injection pressure
e) resin viscosity too high
f) exotic geometry

2) Surface Imperfections:
a) moisture or air bubbles in the resin
b) temperature too high causing resin decomposition
c) not enough pressure to fill the mold completely
d) dirty mold

3) Burned Parts:
a) temperature too high
b) polymer trapped and degraded in the nozzle
c) slow chilling cycle

4) Warped Parts
e) uneven mold surface temperature
f) design flaws
g) parts removed from the mold too early