At work, an electronic component we use suddenly started arriving in individually-sealed plastic bags, rather than bulk packages of 25. I guess the manufacturer felt that their product was too simple and convenient to use as it was, or perhaps they had a waste-production quota they were struggling to meet? So, I designed this little tool to slice the bags open. It clamps onto the edge of a table, up to 1.75" (45mm) thick, using a 1/4"-20 bolt with hex nut, and accepts an X-Acto or similar knife blade through a slot in the top to do the slicing.If there's not enough friction to hold the blade in its slot, you can glue it in place, or wedge it in with a shim of some sort. Skirt material peeled from your printer's bed would probably do the job.