You can’t sharpen a large rotary cutting blade with a small Olfa sharpener. This old technique works on new blades as well as it did on razors back in the day.
If your computer copier is down, or you can’t get it to copy exactly the right size, you can use a retro format: Onionskin paper. It is nearly transparent and, if you use a pencil, you can erase mistakes. You can copy out of library books or other public pattern sources without paying copier costs. And it is easy on the environment, recycling something you throw away! http://www.sewandso.etsy.com