Two puzzles use paper tools: the Cipher Wheel (Days 11 and 24) and the Window Card (Day 17). They are printed at the back of the book to be cut out, but you do not have to cut your copy: print them here on ordinary paper and cut those instead.
No printer? The same pages are at the back of the book (pages 65 and 67); their backs are blank, so cutting them does not damage any puzzle.