My own version of the the wrapping paper cutting tool to work with slightly larger and more widely available blades, and a tapered region under the blade to aid cutting.
Simply push the blade in to the slot with a pair of long nose pliers.
Swann-Morton Blade Size 26 - BPSCA 113 - TL12869
Blades available on amazon from here https://amzn.to/2Db1gw8 or from here: https://ebay.us/UFk0to
Filament available here https://amzn.to/2Avafpy