marker_size = 0.1;
size = 1;
space = 2.5;
max_angle = 0;
// max_angle = 360;
xtimes = 10;
ytimes = 5;
ztimes = 3;

for (x = [0:1:xtimes] )
for (y = [0:1:ytimes] )
for (z = [0:1:ztimes] )
translate(v = [(x-xtimes/2)*space, (y-ytimes/2)*space, (z-ztimes/2)*space]) {
    rotate(rands(0,max_angle,3)) {
        translate([-size/2,0,0]) 
            color([0,1,0]) 
            cube([size,size,size],center=true);
        translate([size/2,0,0]) 
            color([1,0,0]) 
            cube([size,size,size],center=true);
    }
}