cbind a list of matrices

Didn't you simply try:

A<-matrix(c(1.1,1.2,1.3,1.4,1.5,1.6),ncol=3)
B<-matrix(c(2.1,2.2,2.3,2.4,2.5,2.6),ncol=3)
C<-matrix(c(3.1,3.2,3.3,3.4,3.5,3.6),ncol=3)
A

    [,1] [,2] [,3]
[1,]  1.1  1.3  1.5
[2,]  1.2  1.4  1.6

B

    [,1] [,2] [,3]
[1,]  2.1  2.3  2.5
[2,]  2.2  2.4  2.6

C

    [,1] [,2] [,3]
[1,]  3.1  3.3  3.5
[2,]  3.2  3.4  3.6

rbind(A,B,C)

    [,1] [,2] [,3]
[1,]  1.1  1.3  1.5
[2,]  1.2  1.4  1.6
[3,]  2.1  2.3  2.5
[4,]  2.2  2.4  2.6
[5,]  3.1  3.3  3.5
[6,]  3.2  3.4  3.6

rbind(A,A,A)

    [,1] [,2] [,3]
[1,]  1.1  1.3  1.5
[2,]  1.2  1.4  1.6
[3,]  1.1  1.3  1.5
[4,]  1.2  1.4  1.6
[5,]  1.1  1.3  1.5
[6,]  1.2  1.4  1.6