This was designed to use utility knife/box cutter blades, but to expose only a small portion of the edge. Designed to be thrown in the kitchen drawer to easily open the endless number of Amazon packages that seem to be arriving at my front door these days, without using my nice kitchen knives or going out to my shop to get a utility knife.
I included a 3D model of a support I used, because I couldn't get the automatically generated supports from my slicer tuned in well. This support has a .25mm gap between the support and model. On my printer, it pops right off, and I get a good friction fit on the cap. Just position the support under the model on your preferred slicer. See the included screenshot of my slicer with the supports (green) under the body pieces (orange).