xacto blade
thingiverse
You're looking for the perfect X-acto blade to get the job done, like precision-cutting into your exacto storage container. To get started, I recommend checking out Tinkercad, a fantastic online tool where you can edit and create 3D designs with ease - just head over to https://www.tinkercad.com/things/64wZk2szRrf to see what I'm working on.
Download Model from thingiverse
With this file you will be able to print xacto blade with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on xacto blade.