Abstract: A rotary trimming apparatus includes a base for receiving a material, a rail mounted on the base, a cartridge assembly having a plurality of trimming blades for trimming the material, a carriage slidably mounted on the rail, a selector comprising a plurality of engagement slots, and a set of pins for locking into the engagement slots of the selector knob in order to fix the positions of the selector knob and the plurality of trimming blades. The cartridge assembly plurality of trimming blades are rotatably connected to the selector, and the selector is capable of actuating the plurality of trimming blades by rotating on a plane perpendicular to the base.