This paper pad uses 2 ¼" wide rolls of paper register tape. Just flex the ears apart to load the paper roll then tuck it under the hold-down bars to hold it flat. The lower hold-down also doubles as a tear-off guide. I've included two versions: one with a pen rest and one without the pen rest.

This can be printed in most any material. Just print the pad of your choice and two of the hold-down bars. The hold-down bars fit into notches at the top and bottom of the writing surface and are held in place with a dot of superglue at each end.