If you're asking me, I usually print a cardstock pattern, trace, and use a box cutter / Olfa Utility Knife

- I've used a variety of different ones (see below) and find myself always coming back to the Olfa Knife since I can just break off a blade and start anew.
Left to right:
Olfa Utility Knife (most used)
Olfa Art Knife (seldomly used; lots of others love this for corners / curves)
Japanese Skiving Knife "Nobuyoshi" 36mm (planning on replacing this soon)
Fiskar Rotary Cutter (mainly used for straight line cuts)
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