Fingertip X-Acto Blade Holder - Snap-In

thingiverse

This is an X-Acto blade holder inspired by the Fiskars fingertip craft knife holder. It lets you press straight down on the back of the blade, & gives you a lot of control over where it goes. It doesn't really do pushing or stabbing motions, because that's not how you're supposed to use X-Acto blades. You'll want something secure to push the blade under the snap with - I press the tip against the cutting mat, which seems to work fine.