Review: Sun-Star Kadomarun Round Corner Punch

Sun-Star Kadomarun Round Corner Punch

Over the holidays I had added a couple of budget-y priced, portable corner rounders to my Amazon cart. When they arrived I was sorely disappointed. They left nicks in the paper and didn’t have anything to catch the little paper flecks so I was leaving a trail all over my office, the coffee shop and the floor. So when I placed my last order with JetPens, I saw the Sun-Star Kadomarun Round Corner Punch ($7.25) and decided to give it a try instead since I was swearing a blue streak at the crap ones I had bought previously.

Sun-Star Kadomarun Round Corner Punch

Crappy cheap corner punches

Crappy cheap corner punch

Boy, am I ever glad I upgraded! While the Sun-Star Kadomarun Round Corner Punch is a bit larger than the others I purchased, the kidney bean space makes it comfortably ergonomic in the hand. It also has a little trap door on the bottom to catch the paper scraps.

Sun-Star Kadomarun Round Corner Punch back view

Sun-Star Kadomarun Round Corner Punch paper catch

When used, the Sun-Star clicks firmly so you know you have successfully rounded your corner and it makes a perfect clean edge. I found it works particularly well on card stock like index cards and 3x5s. Lighter weight paper worked better if I put two or three sheets in at a time.

Overall the Sun-Star Kadomarun Round Corner Punch is totally worth the price if you like to round the corners of your printables, index cards or paper goods. Its a fun, easy little device to have on hand and makes your pieces look finished fast.

DISCLAIMER: This item was sent to me free of charge by JetPens for the purpose of review. Please see the About page for more details.

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8 comments / Add your comment below

  1. Hi Ana,

    This looks like a pretty nifty little gadget. The idea of not having a mess to clean up is definitely a plus, too.

    I often order from Jet Pens and it has always been a good experience for me. I just may order this punch.

    I already have the,” Midori Eraser Dust Miini Cleaner,” which you reviewed earlier, marked down on my to purchase list. I usually wait for a larger order in order to take advantage of their free shipping.

    Thanks for the review.

    1. Thanks, Robert! It’s definitely worth adding on to your next order if you think you might like rounding the corners of your cards and papers. Its one of the nicest ones I’ve used and super tidy.

  2. Thanks for the great review. I use a punch to round photos for my scrapbook and I am always having problems with rough cuts that need to be trimmed with scissors. I added this punch to my Jet Pens “wish list” and will toss the one I have!

  3. This looks like a great little gadget for paper, will keep it in mind. I’m a crafter and I use the We Are Memory Keepers Corner Chomper. It can punch through heavier cardstock and other materials with no problem. AND it catches the cuttings! It’s one of several crafting tools I recommend over and over again.

  4. Great review! I have one of these -the blue one, in fact- and I love it. I use it primarily to round the corners of my planner when the week is done. Makes it easy to flip to the current week. I had some trouble with the thinner planner paper at first, but I made it work. 🙂

  5. Thanks for the review. Allow me to comment…

    There is a Sun-Star Kadomaru Pro punch that does three corner sizes, 3mm, 5mm, & 8mm. (Note, that’s Kadomaru not Kadomarun like the one being reviewed in the original post; drop the last “n”.) On Amazon they’re about ten bucks each. Here’s a video that shows how it works:

    A good corner punch is indispensable if you print your own pages to go into a refillable notebook or binder. But you will need a corner punch that can handle a reasonable number sheets at-once. A nice corner cutter is called a “Corner Chomper”; it is a pliers-like hand held cutter that can take heavier material or multiple sheets. They cost around fifteen bucks online. Here’s a video showing how the Corner Chompers work:

    Have fun everyone! David

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