In our previous work, a method of fabricating solid models was developed by using an ultravioletlaser. It is intended in this study to apply a CO₂ laser for making solid models, so as toreduce the cost of the system and the fabricating time. A thin liquid layer of cationic epoxy resin (thermosetting resin) was irradiated with CW CO₂ laser light (9.5W, 10.6 μm) to be solidified. It was proved that irradiation with high power laser light caused explosive chain thermopolymerization, and the operating ranges for controllable reaction could be enlarged by fillinginert plastic powder in the resin. A solid model of 20 mm square in bottom and 10 mm in hightwas constructed by repeating laser radiation on resin over the solidified layer 20 times.