Building a projectile capable of surviving launches at nearly 200 mph meant every part of Michael Rechtin’s design was under scrutiny, including the fins that keep the rocket stable in flight. The original fins were 3D printed from plastic and worked well enough for early testing, but they remained one of the more vulnerable parts of the design. A damaged fin could quickly turn a stable flight into an unpredictable one. Using the WAZER Pro waterjet cutter, he cut the fins directly from carbon fiber sheet stock. The process allowed him to quickly turn a digital design into finished parts that matched the geometry of the existing rocket.