Dụng cụ rọc thư (Letter opener)

Update: In case it does not work as expected, I have published also an improved version.

I printed the original model because I had a spare blade for my Facto knife. However I have many more blades for a Japanese style hobby knife. You need to use the small type with a width of approx 9 mm. (see pictures)

First I tried to adapt the Fusion 360file provided. but it was easier to start from scratch. My .f3d file is provided in case you want to make changes.

in the .3mf file there is a pause programmed to put in the blade during printing. This pause is just before the blade will covered.

I printed with pla and 0.1 mm layer height, because the blade is already very thin.
You also need supports from the build plate to get a nice sharp tip.

Have fun.