You can run with these scissors!

They do actually work on some softer (and thicker) materials, but they don't always cut regular 80g letter.

To improve the design, the pieces should be mirrored, so that when you apply lateral force with your thumb, the blades would get tighter together, not separate.

This part was made with Tinkercad. Edit the part online at: https://tinkercad.com/p/acc099f43a602b9f

1. Print out the parts
2. File the top sides of the blades so that they move more smoothly when screwed together
3. Use 12mm 3M screw to bind the pieces together