HP 0706124 REV B - Manual (Page 84)

3-28 Loading Media
Tip The media should be consistently tensioned across its
width when attached to the takeup spool. Ensure
that the web is straight and smooth from side to side.
If necessary, a cardboard core from a roll of masking
or other graphic arts tape can be slipped over the
spool holder to hold it in place.
Loading the media onto a takeup spool that already
has some media on it will change the weight of the
spool and make it more difficult to inadvertently pull
off the media during printing.