'[N][2] getSpoolList ()
Returns a list of the recorded spools. Returns a Nx2 matrix where N is
the number of recorded spools. The first column contains the names of
the spools and the second the lengths of remaining filament.'

def getSpoolList(self):

    slist = []
    for i in range(self.getSpoolCount()):
        item = [self._spool_list[i][0], self._spool_list[i][1]]
        slist.append(item)
    return slist
