No, NO, N O!!! This just means in a case like mine because I can tell you that today my matrix will look like A and tomorrow the matrix will look like C and the next day B=A+/-C so in my case I would never ever just use the same matrix all of the time. One print then another (as in my example) I might (I have not tried it yet but theoretically it should be fine) but never from one day, or even hour, to the next. Basically if the bed has had a chance to cool completely down, as well as the entire printer, forget using a previous matrix.