The Detail That Makes Everything Look Professional: Sun-Star Kadomaru Pro 3-Way Corner Cutter Reviewed
May 21, 2026
Sharp Corners Are So Last Season
There’s a reason professional print shops, greeting card designers, and scrapbooking enthusiasts all round their corners: it looks better. Rounded corners are softer, more refined, and more durable — they don’t dog-ear, they don’t catch on things, and they give any paper project an instantly polished, finished quality. The Sun-Star Kadomaru Pro 3-Way Corner Cutter makes that professional finish accessible to everyone — with three radius sizes (S/M/L), a single-press mechanism, and the build quality you’d expect from one of Japan’s most trusted stationery brands.
Three Radius Sizes in One Tool
The Kadomaru Pro’s defining feature is its 3-way design — three different corner radius sizes built into a single compact body. No swapping blades, no buying separate tools. Simply rotate to the size you need and cut:
S — 3mm Radius: Subtle & Refined
The smallest radius removes just enough of the corner to eliminate sharp points while keeping the overall shape close to square. Ideal for business cards, ID cards, photo prints, and any application where a minimal, understated rounding is preferred.
M — 5mm Radius: The Classic Round
The medium radius is the most versatile and widely used size — the classic rounded corner that looks intentional and professional on everything from greeting cards and bookmarks to scrapbook pages and handmade stationery.
L — 8mm Radius: Bold & Playful
The largest radius creates a noticeably rounded corner with a softer, more playful character. Perfect for children’s projects, decorative cards, photo album pages, and any design where a more expressive, rounded aesthetic is the goal.
One Press. Perfect Corner. Every Time.
Using the Kadomaru Pro couldn’t be simpler. Insert your material into the guide slot at the back of the body, align the corner, and press down on the handle. The blade cuts a clean, precise arc in a single motion — no repositioning, no second cuts, no ragged edges. The result is a perfectly consistent rounded corner that looks the same on every sheet, every time.
Cuts Paper & Laminated Film
The Kadomaru Pro handles more than just standard paper. It cuts cleanly through:
- Up to 3 sheets of 20lb bond paper simultaneously — batch-cut multiple sheets in one press for efficiency
- Laminated film up to 3.9 mils thick — round the corners of laminated cards, ID badges, bookmarks, and protective sleeves without cracking or tearing
- Cardstock, photo paper, craft paper, and most standard stationery materials
Built by Sun-Star: Japanese Stationery Excellence
Sun-Star is a Japanese stationery brand with a decades-long reputation for producing tools that are thoughtfully designed, precisely engineered, and built to last. The Kadomaru Pro reflects that heritage — the mechanism is smooth and consistent, the body is durable, and the blade maintains its cutting quality through thousands of uses. This is not a disposable craft tool; it’s a long-term addition to your creative kit.
Who Is the Kadomaru Pro For?
- Scrapbookers & crafters — round photo corners, journaling cards, and decorative paper elements for a polished, cohesive look
- Card makers & stationery designers — give handmade greeting cards, invitations, and tags a professional finish that stands out
- Photographers — round the corners of printed photos for albums, frames, and display without dog-earing
- Teachers & educators — create durable, professional-looking classroom materials, name tags, and laminated cards
- Bullet journalers & planners — round sticker corners, washi tape ends, and insert cards for a refined aesthetic
- Gift shoppers — a compact, clever tool that any paper crafter will immediately put to use
The Finishing Touch Your Projects Have Been Missing
Rounded corners are one of those details that most people don’t consciously notice — but everyone responds to. They make paper projects look more considered, more professional, and more complete. The Sun-Star Kadomaru Pro gives you three sizes of that finishing touch in a single, beautifully made Japanese tool. Add it to your creative kit and see the difference one small detail makes.
