Wednesday, March 9, 2011

TOOL : Diamond 1 Corner Rounder

I recently bought a heavier duty corner rounder for a few projects I've been working on. I've been using it too much to share it before now.
I'm pleased as punch (no pun intended) with it. It comes with a 1/4" corner rounding die, which is great, but I've just put in an order for a couple of other dies. I'll share them with you when I get them.
It will punch a whole stack of paper/cardstock/etc at a time, which is super handy for rounding the corner on pads or books. The extra scrap falls down a hole at the back, into a trash drawer. There is another drawer at the front for extra dies, and tools.

A couple of drawbacks I've found -
1) The blade really cuts into the blue plastic underneath. The set comes with a few replacements, and I can see I'll need to replace the original pad more quickly than I'd hoped.
2) It's really important to get the paper lined up in the corner just right, so you have to really keep your eye on how you are putting the paper under the blade. There are guides, but for some reason it's easy to slant the paper one way or another.
3) I'm really wishing I had the larger (3/8") die right now. I like the 1/4", but I think I'd like the 3/8" even better.
4) I want to round everything. In fact, I just might.

I bought this guy from Binding101 because they were the cheapest. It's also available from an Amazon dealer. It took about 5 business days to get to me, which was great.

I've tested it on a number of materials, and it works great.
That should about round out this review... (get it?)

I got a few new blades for the cutter- namely a wider diameter rounder, and a 45 degree straight cut (possibly because I was watching BSG at the time.) In total I have 4 blades, from a very small professional curve to a nice big friendly one.

They look like this.
Each bolts on to the cutter with an Ikea style hex key. It's very important to readjust the blue guides after replacing the blade, and from time-to-time while you're using it. (If the blade is too close to the paper, or if it is slightly turned you get a small notch in the side of the curve. Look at the "S" example in the sample picture below. The curve goes into the paper, instead of going straight into the straight side.)
The blade bolts down, and them the blue guides are loosened and adjusted.I cut several scrap pieces of Crane Lettra. It does well, but with a large stack there is a little variation in the shape of the curve from top to bottom. A stack 1/4 inch or smaller works best.
These sheets were cut as a stack.Here are the 4 blades I got; M (45 degree die), S (1/8" die), M (1/4" die comes with the cutter), L (3/8" die).
One thing I forgot to mention, the cutter has a nifty hole and drawer for catching paper scraps (they will still get EVERYWHERE, I've been finding them on the stairs.) The front drawer holds some of the things you need; a couple of blades, the hex keys, etc.

The blade pieces are a bit oily- I would advise wiping them down with a paper towel before hooking them on. The oil has never been on the blade portion, so it doesn't transfer to the paper.

All in all I'm happy- my biggest complaint is the constant adjusting of the blue guides. It's worth it to get rid of those sharp edges (and so much better than craft rounders.)


  1. Hah. Got it.

    These kinds of reviews are awesome. Especially because I never knew of any tool like this in existence.

  2. that's awesome! I love it.


  3. Have you tried using this corner rounder on Crane Lettra? I have had a difficult time finding a corner rounder that doesn't leave nasty grease marks on the paper. I'd be curious to know if you had any luck with this one. Thanks!

  4. I have, it works really well! The blade itself isn't oily, but the piece can definitely use a quick wipe down.

  5. Alison! You're making us drool! We just might have to come over and borrow that... and see you of coarse too!


Thank for the help!