Stanley blade printed label / heat shrink tubing trimmer

Using a 12mm/9mm label printer has its frustrations, they always print a load spare on each side so that the label comes out of the printer enclosure. I have never managed to cut these squarely with scissors so I created this.

It takes a good amount of force to cut through but it does work. Heat shrink is easier.

Parts:
2x M3 x 12mm dome head (to hold the blade)
2x M3 x 25mm dome head (side supports)
4x M3 nuts
2x spring 6.4mm x 10.3mm (or similar), I obtained this from Rolson set 6129