I made some things.
#3D #printable #stencils to add #lines (#wideRule & #standardRule) as well as #grids, #tables, & #todo #checklists to #blank 3.5"x5.5" #pocketNotebooks (like #FieldNotes or #Moleskine or more cost-effective alternatives).
Can also be used in larger or smaller notebooks. Can be used to turn already lined paper into grid-paper.