Had this idea for printing the cover slip flat, and then bending it into place.

The cover would sit in the slots here.

Problem with this is I removed the ability to disengage the ratchets as it was getting too complicated.  This means you can't get the tape back out as there isn't enough clearance between the posts and the tape thickness, and besides.. you would have to go out the side to do it.

New idea... use posts raised up some more, and snap the cover under it.  The ends of the slip would be raised then to meet the post instead.  I'm going with that.