OLFA CMP-3 Circle Cutter: Set the Size Before You Cut

Cutting a round applique with scissors means tracing the outline and then steering around it without turning a smooth curve into small corners. OLFA’s CMP-3 changes that job: a fixed center point guides an 18mm rotary blade around the fabric. For a project with several same-size circles, the appeal is repeating a set geometry rather than repeatedly following a drawn line.

It is a specialized purchase. A straight rotary cutter remains more versatile for strips, and scissors still make sense for occasional freeform shapes. The CMP-3 earns a place when circular pieces keep returning to your worktable and you are willing to practice the motion before cutting valuable fabric.

Confirm the diameter before buying

The current North American manufacturer page specifies finished circles from 1.5 to 8.75 inches; OLFA’s international page gives a 4–22cm range. Those are published ranges, not a measurement we made. An older package photographed in the selected listing instead prints 1⅞ to 8½ inches. If your design sits close to either end, confirm the supplied version with the seller before ordering.

The setting that determines the circle is the distance between the pivot and blade: that distance is the radius, half the finished diameter. For a six-inch circle, the geometry requires a three-inch blade-to-center spacing. Confusing the finished width with that spacing produces a piece twice the intended size.

This is also why a small decorative dot is a different job from a large applique. Compare your actual pattern dimensions with the available range first. Buying a circle cutter and then discovering that most pieces are smaller than it can make is an avoidable mismatch.

The ratchet changes the motion, not the need for control

The CMP-3 uses a sliding center pivot and a separate ratchet handle. The handle lets you reset your hand position while continuing around the center; you do not have to force one long wrist twist through the entire turn. OLFA identifies the design for both right- and left-handed users.

Keep the tool upright and work clockwise, following the manufacturer’s instructions. Slow, controlled movement matters more than a quick sweep. The center point must stay put while the blade travels around it, so this is not a freehand cutter that tolerates the fabric sliding underneath.

A Quilter’s Review report describes a learning period with uneven pressure and missed threads, and notes that excessive speed or pressure bunched fabric. That experience belongs to the reviewer, but it is a useful reason to reserve a scrap for practice. The mechanism guides a circle; it does not remove every handling decision.

Give the pivot and blade a suitable work surface

OLFA recommends its cutting mat and a practice pass before the actual cut. Use a work area that can accommodate the full circle, with the fabric laid flat. The pivot is a point that enters the material at the center, so consider whether that center mark is acceptable for the finished piece.

This is a practical distinction for applique versus a piece whose center must remain unmarked. If puncturing the center would spoil the design, a traced template and scissors may fit the project better. The rotary cutter’s convenience should serve the result you need.

The blade cover and pivot guard protect the cutting parts during storage. Cover both after use and follow the maker’s blade-change instructions. The replacement blade is the compatible OLFA 18mm rotary type; a larger blade from another cutter is not an interchangeable upgrade.

Buy for a repeat pattern, rather than one uncertain project

The strongest case is a quilt or craft routine that repeatedly calls for circles within the confirmed size range. Set the diameter, test the material and grip, then repeat a motion that suits the pattern. That is a more concrete benefit than a general promise of perfect cuts.

Skip it when the project mostly needs tiny circles, straight strips or irregular curves. It also adds another sharp tool to store, and a suitable mat is part of the working setup. Count those requirements alongside the cutter itself.

Choose the CMP-3 for recurring fabric-circle work when the pivot mark, size range and clockwise technique fit your project. Confirm the packaging when a boundary size matters, and begin on a scrap. Those small checks make this specialist tool a more deliberate purchase.