I am a electrician by trade, as i mentioned before in my other threads. Having a cutter that can cut stranded cables is a must. So I am always very pissed when I got a MT with cutter than simply cannot cut soft wires. I think the usual practice of most people, including me, use a tiny diamond file to sharpen the cutter. how to tell if its sharpened? using finger nails as gauge rite? Did the same for all my juices but none of them will cut. Most will only cut the insulation and fold over the copper strands. Well what I found out yesterday, or maybe I am just late to the party.. The tip of the Juice cutters are very rounded. Most of us will stop filling once we have the cutter sharp enough for fingernails. It works for most pliers but not on juice. I pick out Juice because, they are really really rounded. A considerable amount have to be filed down on the juice to make it good. If not done enough, even when you think its sharp enough, the wires will still slip thru as the 2 sharpened cutters still do not meet.
Have a good look at your cutter. if it doesn't cutter, it probably not because its not sharp, its simply not meeting at the cutter. Juice have very long teeth. Do not be afraid to file down hard on it. I took off almost close to 1mm to clear the rounded tip.
On the left is stock, right is filed down.
You know you have a good cutter when the part you snips flies off when you cut. All my Juices does that now.
Of course, You will need a decently tight pivot for it to work. All my Juice pliers drops open by gravity. So they are not that super tight kind of tight.
To fix loose plier pivot, see here before reaching for the Hammer and punch..
https://forum.multitool.org/index.php/topic,75195.0.html