New Sunstar Kadomaru Pro, Corner Cutter (S4765036) (Kadomaru Pro) with Authentic Hologram US, UK, EU Only

The media could not be loaded. This baby is a wonder! I had a cheap corner rounder previously and knew I needed an upgrade. I've used her on thicker cardstock, PLASTIC COVERS, and even planners. The planner I use currently is the one you see in the video, I call her Big Bertha. It's accurate, trust me, she's a hefty Hemlock & Oak dated 2025 daily planner. I love her, but....she came with square pages and this girl here? NO square pages (wire hangers are fine haha)! I have rounded three full planners, actually, so the durability and the upgrade in quality cannot be beat. it's very easy to use, it works well so you can actually round multiple pages at one and, as I said, even plastic covers, though that takes some muscle power. It's a nice size, not much bigger than my cheaper one and again, you can just use it for ages! THREE H&O planners and tons of other things as well. When (or IF) this baby ever gives up the ghost, I will promptly be getting exactly this to replace it.

I recently purchased the Paper Corner Cutter, and I must say, I’m quite pleased with the results. This handy tool provides a simple yet effective way to give papers and cards a perfect finish, adding a professional touch to my projects.Using the corner rounder cutter is a breeze. I just insert the corner of my desired material into the back of the body and press the handle down to cut the corner. The process is smooth and effortless, and the end result is consistently neat and tidy corners.What I appreciate most about this cutter is its efficiency and ease of use. It works like a punch, delivering clean cuts with minimal effort. The compact design also makes it easy to store and transport, making it a convenient addition to my crafting supplies.Additionally, knowing that this corner cutter comes from a reputable Japanese goods and stationary brand gives me confidence in its quality and reliability. It’s evident that attention to detail has been paid to its design and functionality.Overall, I’m very satisfied with the Paper Corner Cutter. It’s a simple yet effective tool that has helped me achieve professional-looking results in my projects. If you’re in need of a corner rounding solution for your papers and cards, I highly recommend giving this cutter a try.

(I mean, unless you’re trying to round off a steel latch plate or something. Get an angle grinder.)Things to know:-There are multiple moving parts-These parts are probably not in perfect adjustment right out of the box.-You can make the adjustments necessary to do your project, using a Phillips screwdriver.I sympathize with those who had frustrations right out of the box with this item. For me, the blade assembly got stuck in the down position while chomping index cards (one at a time). But I fixed it, and the following description may help somebody out there.First, it’s worth bearing in mind that this product is made in Japan (not elsewhere in Asia), so you should expect the design and manufacturing to be very good. And it’s not a solid-state electronic device so you should expect to be able to disassemble and service it to some degree.Aside: If you just want nice-looking stationery without having to adjust, maintain, or even understand your tool, then give your project to the kid at the copy center. But if you are like me and enjoy that kind of thing, or if you just really want to cut corners, then it’s best not to, um…cut corners.Moving Parts: This product cuts a radiused corner in sheet material (usually paper or card stock) as the lever pushes the curved blade down across the edge of a metal plate, rounded with a matching curve, that support the material horizontally.The user operates the cutter via a lever that pivots on one side and presses down on the blade housing in the center (For you kids at home, that’s called a Class 2 lever, like a wheelbarrow). Maybe there is a video out there with a hand model who makes it look easy to use one finger on the tip of the lever, or squeeze it between your thumb and finger, but don’t bother. Use a solid work surface (wooden table, tile floor, concrete driveway, deck of a ship, whatever is convenient) and push straight down on the center, using your palm. This should give you the best chance of a clean cut the first time. The thicker the material, the more you must put your weight into it.Another Aside: The horizontal metal thing that opposes the vertical blade during the cut, is what I’m calling the “shearing plate”, because that is what we’re adjusting. The real technical term is probably in Japanese, so you’re welcome. I like to be accurate enough so you know what I’m talking about, but I promise not to get ridiculous about it and string a bunch of terms together for the sake of precision like they would do in German (“Ent now, ze tenshun iss adjustet bei tyrning ze Shearingplateassemblybasehousingsecurefasteningscrew…”)The shearing plate, fastened to a small movable plastic block, is meant to slide outward a bit with each cut. When the lever resets, the shearing plate assembly returns toward the center via a spring. You can’t see these springs without disassembling the product, but you can adjust the resistance to the spring tension via one of three screws underneath (one for each radius size).If the screw is totally snug and the shearing plate assembly does not move at all, the blade housing is likely to get stuck in the down position. If the screw is too loose, there will be enough play that the shearing plate assembly to move too soon or cant too much, resulting in either a ragged cut or no cut at all. A loose shearing plate will also fail to reset flush with the base, which narrows the cutting slot enough that it may not accept another sheet after the first cut.The correct adjustment will vary according to the material. For light thin cutting, like one sheet of printer paper, the screws should be “almost” snug. Wear eye protection at all times. To avoid stripping the threads in the plastic base, turn the screw by holding the screwdriver by the SHANK (not the handle) between your thumb and fingers, and turn clockwise until your finger grip fails and you would have to change to gripping the handle to turn any further. That is snug (or “finger tight”). Then back off by about ¼ to ½ turn. For thicker cuts, back the screw off a little more. Test and see. Again, if it’s too loose, the cut will fail in thick material, and a second sheet may bind on the way in. I got this to work for several sheets of paper, up to six stacked index cards, and two layers of a plastic drawer liner. Do some tests first to get the adjustment right, then push as hard as necessary. If your full body weight pressed over a stiff arm is not sufficient to round the corner off your material, then either it is too thick for this product to cut effectively, or you are severely malnourished. Break for a sandwich and try again later, or try the angle grinder.

I bought this for my wife because she needed a corner rounder she could grip, she has problems with her hands. This is one of the best corner rounders we have and is now the most used. It has 3 choices, small, medium and large. It collects the clippings and it is easy to empty and put the bottom cover back on to collect more. It aligns the paper to round corners perfectly. It is comfortable tho hold and handle. Very durable, she has dropped it a few times, it still works. She hasn’t had to ‘clean’ it with aluminum foil. It remains sharp. And the design is comfortable. My wife uses it on a flat surface, but it can be held to use. Highly recommend this corner rounder.

this is the only corner rounder i’ve found that actually works well!! i use these to punch laminated products! idk if it was just mine but only my large size works. however, it’s definitely something i recommend and will repurchase. it’s easy to use and has lasted several hundred orders with my etsy shop! it’s nice and compact so it doesn’t take up much room!

I knew as soon as I used this I had to give it 5 stars! This is the first edge cutter that cuts my thick laminated paper absolutely beautifully and works even more smoothly than I expected! It literally cuts through like butter and I haven't had any issues with it getting the laminate stuck in the blade at all like other cutters I have used. The cuts are perfectly smooth and clean. It is also super lightweight and very easy to use. This is probably the best edge cutter out there!