Table 2.

The thermal expansion coefficient of each layer for different printing speeds.

αi (1/°C)		Sp (mm/s)
	10	20	40	70
${\alpha }_1$	−0.0006	−0.0016	−0.0018	−0.00252
${\alpha }_2$	−0.0004	−0.0014	−0.0016	−0.00222
${\alpha }_3$	−0.0002	−0.0011	−0.0013	−0.0022
${\alpha }_4$	−0.00009	−0.0008	−0.0011	−0.00172
${\alpha }_5$	−0.00007	−0.0006	−0.0008	−0.00152
${\alpha }_6$	−0.00005	−0.0004	−0.0005	−0.00122